in the plantations, which could not be found on the heath. The effect on the insects must have been still greater, for six insectivorous birds were very common in the plantations, which were not to be seen on the heath; and the heath was frequented by two or three distinct insectivorous birds. Here we see how potent has been the effect of the introduction of a single tree, nothing whatever else having been done, with the exception of the land having been inclosed, so that cattle could not enter. But how important an element inclosure is, I plainly saw near Farnham, in Surrey. Here there are extensive heaths, with a few clumps of old Scotch firs on the distant hilltops: within the last ten years large spaces have been inclosed, and self-sown firs are now springing up in multitudes, so close together that all cannot live. When I ascertained that these young trees had not been sown or planted, I was so much surprised at their numbers that I went to several points of view, whence I could examine hundreds of acres of the uninclosed heath, and literally I could not see a single Scotch fir, except the old planted clumps. But on looking closely between the stems of the heath, I found a multitude of seedlings and little trees which had been perpetually browsed down by the cattle. In one square yard, at a point some hundred yards distant from one of the old clumps, I counted thirty-two little trees; and one of them, with twentysix rings of growth, had, during many years, tried to raise its head above the stems of the heath, and had failed. No wonder that, as soon as the land was inclosed, it had became thickly clothed with vigorously growing young firs. Yet the heath was so extremely barren and so extensive that no one would ever have imagined that cattle would have so closely and effectually searched it for food. Here we see that cattle absolutely determine the existence of the Scotch fir; but in several parts of the world insects determine the existence of cattle. Perhaps Paraguay offers the most curious instance of this; for here neither cattle nor horses nor dogs have ever run wild, though they swarm southward and northward in a feral state; and Azara and Rengger have shown that this is caused by the greater number in Paraguay of a certain fly, which lays its eggs in the navels of these animals when first born. The increase of these flies, numerous as they are, must be habitually checked by some means, probably by other parasitic insects. Hence, if certain insectivorous birds were to decrease in Paraguay, the parasitic insects would probably increase; and this would lessen the number of the navel-frequenting flies-then cattle and horses would become feral, and this would certainly greatly alter (as indeed I have observed in parts of South America) the vegetation: this again would largely affect the insects; and this, as we have just seen in Staffordshire, the insectivorous birds, and so onward in everincreasing circles of complexity. Not that under nature the relations will ever be as simple as this. Battle within battle must be continually recurring with varying success; and yet in the long run the forces are so nicely balanced that the face of nature remains for long periods of time uniform, though assuredly the merest trifle would give the victory to one organic being over another. Nevertheless, so profound is our ignorance, and so high our presumption, that we marvel when we hear of the extinction of an organic being; and as we do not see the cause, we invoke cataclysms to desolate the world, or invent laws on the duration of the forms of life! I am tempted to give one more instance showing how plants and animals, remote in the scale of nature, are bound together by a web of complex relations. I shall hereafter have occasion to show that the exotic Lobelia fulgens is never visited in my garden by insects, and consequently, from its peculiar structure, never sets a seed. Nearly all our orchidaceous plants absolutely require the visits of insects to remove their pollen-masses and thus to fertilize them. I find from experiments existence of the species. In some cases it can be shown that widely-different checks act on the same species in different districts. When we look at the plants and bushes clothing an entangled bank, we are tempted to attribute their proportional numbers and kinds to what we call chance. But how false a view is this! Every one has heard that when an American forest is cut down, a very different vegetation springs up; but it has been observed that ancient Indian ruins in the Southern United States, which must formerly have been cleared of trees, now display the same beautiful diversity and proportion of kinds as in the surrounding virgin forest. What a struggle must have gone on during long centuries between the several kinds of trees, each annually scattering its seeds by the thousand; what war between insect and insect -between insects, snails, and other animals with birds and beasts of prey-all striving to increase, all feeding on each other, or on the trees, their seeds and seedlings, or on the other plants which first clothed the ground and thus checked the growth of the trees! Throw up a handful of feathers, and all fall to the ground according to definite laws; but how simple is the problem where each shall fall compared to that of the action and reaction of the innumerable plants and animals which have determined, in that humble-bees are almost indispensable to the fertilization of the heart's-ease (Viola tricolor), for other bees do not visit this flower. I have also found that the visits of bees are necessary for the fertilization of some kinds of clover; for instance, 20 heads of Dutch clover (Trifolium repens) yielded 2,290 seeds, but 20 other heads protected from bees produced not one. Again, 100 heads of red clover (T. pratense) produced 2,700 seeds, but the same number of protected heads produced not a single seed. Humble-bees alone visit red clover, as other bees cannot reach the nectar. It has been suggested that moths may fertilize the clovers; but I doubt whether they could do so in the case of the red clover, from their weight not being sufficient to depress the wing petals. Hence we may infer as highly probable that, if the whole genus of humble-bees became extinct or very rare in England, the heart's-ease and red clover would become very rare, or wholly disappear. The number of humble-bees in any district depends in a great measure upon the number of field-mice, which destroy their combs and nests; and Col. Newman, who has long attended to the habits of humble-bees, believes that "more than two-thirds of them are thus destroyed all over England." Now the number of mice is largely dependent, as every one knows, on the number of cats; and Col. Newman says, "Near villages the course of centuries, the proportional and small towns I have found the nests of humble-bees more numerous than elsewhere, which I attribute to the number of cats that destroy the mice." Hence it is quite credible that the presence of a feline animal in large numbers in a district might determine, through the intervention first of mice and then of bees, the frequency of certain flowers in that district! In the case of every species, many different checks, acting at different periods of life, and during different seasons or years, probably come into play; some one check or some few being generally the most potent; but all will concur in determining the average number or even the numbers and kinds of trees now growing on the old Indian ruins! The dependency of one organic being on another, as of a parasite on its prey, lies generally between beings remote in the scale of nature. This is likewise sometimes the case with those which may be strictly said to struggle with each other for existence, as in the case of locusts and grass-feeding quadrupeds. But the struggle will almost invariably be most severe between the individuals of the same species, for they frequent the same districts, require the same food, and are exposed to the same dangers. In the case of varieties of the same species, the struggle will generally be almost equally severe, and we sometimes see the contest soon decided: for instance, if several varieties of wheat be sown together, and the mixed seed be resown, some of the varieties which best suit the soil or climate, or are naturally the most fertile, will beat the others and so yield more seed, and will consequently in a few years supplant the other varieties. To keep up a mixed stock of even such extremely close varieties as the variously-colored sweet peas, they must be each year harvested separately, and the seed then mixed in due proportion, otherwise the weaker kinds will steadily decrease in number and disappear. So again with the varieties of sheep it has been asserted that certain mountainvarieties will starve out other mountainvarieties, so that they cannot be kept together. The same result has followed from keeping together different varieties of the medicinal leech. It may even be doubted whether the varieties of any of our domestic plants or animals have so exactly the same strength, habits, and constitution, that the original proportions. of a mixed stock (crossing being prevented) could be kept up for half a dozen generations, if they were allowed to struggle together, in the same manner as beings in a state of nature, and if the seed or young were not annually preserved in due proportion. As the species of the same genus usually have, though by no means invariably, much similarity in habits and constitution, and always in structure, the struggle will generally be more severe between them, if they come into competition with each other, than between the species of distinct genera. We see this in the recent extension over parts of the United States of one species of swallow having caused the decrease of another species. The recent increase of the missel-thrush in parts of Scotland has caused the decrease of the song-thrush. How frequently we hear of one species of rat taking the place of another species under the most different climates! In Russia the small Asiatic cockroach has everywhere driven before it its great congener. In Australia the imported hive-bee is rapidly exterminating the small, stingless native bee. One species of charlock has been known to supplant another species; and so in other cases. We can dimly see why the competition should be most severe between allied forms, which fill nearly the same place in the economy of nature; but probably in no one case could we precisely say why one species has been victorious over another in the great battle of life. A corollary of the highest importance may be deduced from the foregoing remarks; namely, that the structure of every organic being is related, in the most essential yet often hidden manner, to that of all the other organic beings, with which it comes into competition for food or residence, or from which it has to escape, or on which it preys. This is obvious in the structure of the teeth and talons of the tiger; and in that of the legs and claws of the parasite which clings to the hair on the tiger's body. But in the beautifully plumed seed of the dandelion, and in the flattened and fringed legs of the water-beetle, the relation seems at first confined to the elements of air and water. Yet the advantage of plumed seeds no doubt stands in the closest relation to the land being already thickly clothed with other plants; so that the seeds may be widely distributed and fall on unoccupied ground. In the waterbeetle, the structure of its legs so well adapted for diving, allows it to compete with other aquatic insects, to hunt for its own prey, and to escape serving as prey to other animals. The store of nutriment laid up within the seeds of many plants seems at first sight to have no sort of relation to other plants. But from the strong growth of young plants produced from such seeds, as peas and beans, when sown in the midst of long grass, it may be suspected that the chief use of the nutriment in the seed is to favor the growth of the seedlings, while struggling with other plants growing vigorously all around. Look at a plant in the midst of its range, why does it not double or quadruple its numbers? We know that it can perfectly well withstand a little more heat or cold, dampness or dryness, for else where it ranges into slightly hotter or colder, damper or drier, districts. In this case we can clearly see that if we wish in imagination to give the plant the power of increasing in number, we should have to give it some advantage over its competitors, or over the animals which prey on it. On the confines of its geographical range, a change of constitution with respect to climate would clearly be an advantage to our plant; but we have reason to believe that only a few plants or animals range so far that they are destroyed exclusively by the rigor of the climate. Not until we reach the extreme confines of life, in the Arctic regions or on the borders of an utter desert, will competition cease. The land may be extremely cold or dry, yet there will be competition between some few species, or between the individuals of the same species, for the warmest or dampest spots. Hence we can see that when a plant or animal is placed in a new country among new competitors, the conditions. of its life will generally be changed in an essential manner, although the climate may be exactly the same as in its former home. If its average numbers are to increase in its new home, we should have to modify it in a different way to what we should have had to do in its native country; for we should have to give it some advantages over a different set of competitors or enemies. It is good thus to try in imagination to give to any one species an advantage over another. Probably in no single instance should we know what to do. This ought to convince us of our ignorance on the mutual relations of all organic beings; a conviction as necessary as it is difficult to acquire. All that we can do is to keep steadily in mind that each organic being is striving to increase in a geometrical ratio; that each at some period of its life, during some season of the year, during each generation or at intervals, has to struggle for life and to suffer great destruction. When we reflect on this struggle, we may console ourselves with the full belief that the war of nature is not incessant, that no fear is felt, that death is generally prompt, and that the vigorous, the healthy, and the happy survive and multiply. CELTIC ELEMENTS IN ENGLISH POETRY1 MATTHEW ARNOLD The philosophical pessimism consequent upon the dissemination of the Darwinian theory found its sincerest expression in the poetry of Matthew Arnold (1822-1888). While Arnold's poetry is tinged with the sadness of resignation and religious doubt, his prose is militant against the rising commercialism of his age. As a critic he stresses the influence of literature on the life of the reader, for he held that "the end and aim of all literature is a criticism of life." Significant phrases that he added to the language of literary criticism are Culture and Anarchy, Sweetness and Light, Dissidence of Dissent, Hebraism and Hellenism. The essay on Celtic Literature (1867) unites simplicity of a classic style with genuine enthusiasm. THE Celt's quick feeling for what is noble and distinguished gave his poetry style; his indomitable personality gave 1From On the Study of Celtic Literature and on Translating Homer by Matthew Arnold Published by The Macmillan Company. Reprinted by permission. it pride and passion; his sensibility and nervous exaltation gave it a better gift still, the gift of rendering with wonderful felicity the magical charm of nature. The forest solitude, the bubbling spring, the wild flowers, are everywhere in romance. They have a mysteri ous life and grace there; they are Nature's own children, and utter her secret in a way which make them something quite different from the woods, waters, and plants of Greek and Latin poetry. Now of this delicate magic, Celtic romance is so preeminent a mistress, that it seems impossible to believe the power did not come into romance from the Celts. Magic is just the word for it-the magic of nature; not merely the beauty of nature -that the Greeks and Latins had; not merely an honest smack of the soil, a faithful realism-that the Germans had; but the intimate life of Nature, her weird power and her fairy charm. As the Saxon names of places, with the pleasant wholesome smack of the soil in them-Weathersfield, Thaxted, Shal ford-are to the Celtic names of places, with their_penetrating, lofty beauty Velindra, Tyntagel, Caernarvon-so is the homely realism of German and Norse nature to the fairy-like loveliness of Celtic nature. Gwydion' wants a wife for his pupil: "Well," says Math, "we will seek, I and thou, by charms and illusions, to form a wife for him out of flowers. So they took the blossoms of the oak, and the blossoms of the broom, and the blossoms of the meadow-sweet, and produced from them a maiden, the fairest and most graceful that man ever saw. And they baptized her, and gave her the name of Flower-Aspect." Celtic romance is full of exquisite touches like that, showing the delicacy of the Celt's feeling in these matters, and how deeply Nature lets him come into her secrets. The quick dropping of blood is called "faster than the fall of the dewdrop from the blade of reed-grass upon the earth, when the dew of June is at the heaviest." And thus is Olwen described: "More yellow was her hair than the flower of the broom, and her skin was whiter than the foam of the wave, and fairer were her hands and her fingers than the blossoms of the wood The following Celtic passages are quoted from Lady Charlotte Guest's Mabinogion (1838), a collection of eleven Welsh prose tales. anemony amidst the spray of the meadow fountains." For loveliness it would be hard to beat that; and for magical clearness and nearness take the following: "And in the evening Peredur entered a valley, and at the head of the valley he came to a hermit's cell, and the hermit welcomed him gladly, and there he spent the night. And in the morning he arose and when he went forth, behold, a shower of snow had fallen the night before, and a hawk had killed a wild-fowl in front of the cell. And the noise of the horse scared the hawk away, and a raven alighted upon the bird. And Peredur stood and compared the blackness of the raven, and the whiteness of the snow, and the redness of the blood, to the hair of the lady whom best he loved, which was blacker than the raven, and to her skin, which was whiter than the snow, and to her two cheeks, which were redder than the blood upon the snow appeared to be." And this, which is perhaps less striking, is not less beautiful : "And early in the day Geraint and Enid left the wood, and they came to an open country, with meadows on one hand and mowers mowing the meadows. And there was a river before them, and the horses bent down and drank the water. And they went up out of the river by a steep bank, and there they met a slender stripling with a satchel about his neck; and he had a small blue pitcher in his hand, and a bowl on the mouth of the pitcher." And here the landscape, up to this point so Greek in its clear beauty, is suddenly magicalized by the romance touch: "And they saw a tall tree by the side of the river, one-half of which was in flames from the root to the top, and the other half was green and in full leaf." Magic is the word to insist upon-a magically vivid and near interpretation of nature; since it is this which constitutes the special charm and power of the effect I am calling attention to, and it is for this that the Celt's sensibility gives him a peculiar aptitude. But the matter |