Contributions from the Biological Laboratories in Princeton University, Volume 3Princeton University Press, 1912 Consists of reprints of articles from various journals. |
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Contributions from the Biological Laboratories in Princeton University, Volume 5 Visualização completa - 1916 |
Termos e frases comuns
adult AMERICAN JOURNAL body wall cat embryo series caudal division CEPHALIC ARCH cephalic division CEPHALIC VEIN cercariae CHARLES F. W. MCCLURE cleavage coelom common jugular communication confluence connection cytoplasm districts dorsal plexus dorsal somatic tributaries dorsal tributaries dorsal veno-lymphatic plexus dorso-lateral dorso-medial DUCT OF CUVIER ectoderm eggs embryo fig external jugular fenestrated formation HUNTINGTON AND CHARLES internal jugular vein intestine JOURNAL OF ANATOMY-VOL jugular lymph sac jugular sac jugular vein later stages lateral aspect left side lymphatic plexus lymphatic system lymphatico-venous mesenteries mesoderm mitosis muscle neoblasts nuclei para-precardinal channel phatic polar body portion posterior end precardinal tributary precardinal vein Precava primitive ulnar vein promontory redia regeneration right side separation somites sporocyst stomodeum STRAIGHT SEGMENT SUBCLAVIAN APPROACH subclavian veins tap of evacuation TAP TAP TAP thoracic duct thyro-cervical artery tissue trunk veno veno-lymphatic component venous channels venous system ventral plexus ventral veno-lymphatic plexus vessels vitellarium worms
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Página 392 - ... happened to come across a single one who seemed to doubt about the permanence of species. Even Lyell and Hooker, though they would listen with interest to me, never seemed to agree. I tried once or twice to explain to able men what I meant by Natural Selection, but signally failed. What I believe was strictly true is that innumerable well-observed facts were stored in the minds of naturalists ready to take their proper places as soon as any theory which would receive them was sufficiently explained.
Página 386 - What a piece of work is man," or any other organism ! Such adaptations to general conditions of existence are so common that to most persons they do not seem remarkable, while some peculiar adaptation, such as the leaf insect, or the Venus fly-trap, seems wonderful simply because it is not common. Many of these more uncommon adaptations have played an important part in the discussions of the various theories of evolution which have been advanced during the past century. As illustrations of adaptations...
Página 377 - At last gleams of light have come, and I am almost convinced (quite contrary to the opinion I started with) that species are not (it is like confessing a murder) immutable.
Página 377 - But the conclusions I am led to are not widely different from his ; though the means of change are wholly so. I think I have found out (here's presumption !) the simple way by which species become exquisitely adapted to various ends. You will now groan, and think to yourself, "on what a man have I been wasting my time and writing to.
Página 377 - I have been now ever since my return engaged in a very presumptuous work, and I know no one individual who would not say a very foolish one. I was so struck with the distribution of the Galapagos organisms, &c.
Página 377 - It has sometimes been said that the success of the Origin proved "that the subject was in the air," or "that men's minds were prepared for it." I do not think that this is strictly true, for I occasionally sounded not a few naturalists, and never happened to come across a single one who seemed to doubt about the permanence of species.
Página 377 - that the subject was in the air," or "that men's minds were prepared for it." I do not think that this 50 is strictly true, for I occasionally sounded not a few naturalists, and never happened to come across a single one who seemed to doubt about the permanence of species. Even Lyell and Hooker, though they would listen with interest to me, never seemed to agree.
Página 381 - Darwinism now belongs to history; like that other curiosity of our century, the Hegelian philosophy; both are variations on the theme: how one manages to lead a whole generation by the nose.
Página 449 - The lymphatic system of the embryo pig begins at two blind ducts which bud off from the veins in the neck. At the very start the openings of these ducts into the veins are guarded by valves formed by the direction which the endothelial bud takes as it grows from the vein. In the ducts themselves there are no valves at first. From these two buds and later from two similar buds in the inguinal region ducts grow toward the skin and widen out to form four lymph sacs or hearts and from these sacs the...
Página 380 - Although this was the chief corner stone in Darwin's evolutionary philosophy, it was not the only stone in that structure, as is the case with some of his followers. Darwin was broader than " Darwinism." He recognized more than this one factor of evolution, though he always believed natural selection to be the chief one. I need not repeat here how Darwin was led to adopt this theory; how he found that selection on the part of the breeder was the factor which determined the course of transformation...