The American Monthly Microscopical Journal, Volume 7

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Romyn Hitchcock, 1886
 

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Página 102 - It surrounds them, as a spider does its prey, with a fibrous net of narrow meshes, which is gradually converted into an impenetrable covering. While, however, the spider sucks its prey, and leaves it lying dead, the fungus, incites the algae taken in its net to more rapid activity ; nay, to more vigorous increase.
Página 13 - I found in its cellular tissue numerous mites of the species gallinorum, above described. From the results of these examinations, it seems probable that a considerable amount of disease prevailing among American domestic fowls and not referable to any known type, may be due to the presence of such parasites as I found iu the cases above mentioned.
Página 176 - Dutch naturalist, has shown by measuring and weighing newly-born children, that even in them the right arm is more developed than the left. According to the same law of divergent adaptation, both eyes also frequently develop differently. If, for example, a naturalist accustoms himself always to use one eye for the microscope (it is better to use the left), then that eye will acquire a power different from that of the other, and this division of labour is of great advantage. The one eye will become...
Página 89 - With these eye -pieces, particularly with that of 25 mm. focal length, the field of view is surprisingly uniform. Of the ten lenses of which the objective is composed, two only are of siliceous glass, the other eight being made of borates and phosphates. The crown and flint glass now used by opticians does not contain (as essential components) more than six chemical elements, O, Ca, K, Na, Pb, and Si, whilst the new objective contains not less than fourteen elements. The optical principle on which...
Página 11 - I have incidentally examined several sick domestic fowls in order to ascertain their ailments. The first examined was in a moribund condition when received, and died within an hour after it was brought to my notice. Its comb was of a deep red color, abnormally so, the tips being somewhat black. On dissection, its general viscera presented nothing peculiar, but on removing that of the thorax and abdomen, the lungs excepted, I observed, on the intercostal muscles bordering the ribs, what resembled...
Página 12 - I think it probable that these mites, after they have effected a lodgment in the lungs, bore through the pleura and invade the thoracic and abdominal cavities, where they breed in large numbers, producing great irritation, and ultimately the death of the fowl. About two months after the dissection of the...
Página 13 - ... calcareous specks. Megnin states that in Europe this acarus has been found in all turkey hens, and especially in foreign turkeys of the family Phasania. He says that these acari gather in millions in the cellular tissue and destroy the fibers, but without causing any other change than the production of the calcareous concretions spoken of. He further says: " They have been noticed in such numbers in old birds as to leave no doubt as to their being the cause of death.
Página 194 - ... which we have yet attained. The vastness and the might of Ocean, and the manner in which it cherishes the feeblest and most fragile beings, alike speak to us of Him -who holds it in the hollow of his hand, and gave to it of old its boundaries and its laws...
Página 12 - I next removed a small portion of the lung tissue, and placing it under the microscope, here again discovered several living mites. Another portion was removed from the lungs, not exceeding half a grain in weight, when three more mites were discovered. These last were so lively that it was difficult to keep them long in view without changing the stage.
Página 102 - As the result of my researches all these growths [Lichens] are not simple plants, not individuals in the ordinary sense of the word; they are rather colonies, which consist of hundreds and thousands of individuals, of which, however, one alone plays the master, whilst the rest, in perpetual captivity, prepare the nutriment for themselves and their master.

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