In the developing eggs of insects the nuclei, together with some cytoplasm, migrate to the periphery of the egg. Herbst pointed out that this might be a case of chemotropism, caused by the oxygen surrounding the egg. The writer has expressed the opinion that the formation of the blastula may be caused generally by a tropic reaction of the blastomeres, the latter being forced by an outside influence to creep to the surface of the egg.英文原著 · 《Darwin and Modern Science》
Then he uttered a low growl. Instantly a score of apes leaped to their feet. There savage little eyes sped quickly around the periphery of the clearing. The king ape was the first to see the two figures upon the branch. He gave voice to an ominous growl. Then he took a few lumbering steps in the direction of the intruders. His hair was bristling. His legs were stiff, imparting a halting, jerky motion to his gait.英文原著 · 《THE SON OF TARZAN》
Prolonged insomnia, prolonged physical exertion, infections, injections of toxins and of strychnin, rage and fear, physical injury under anesthesia, in fact, all the adequate stimuli which affected the brain and the adrenals, produced constant and identical histologic changes in the liver--the cells stained poorly, the cytoplasm was vacuolated, the nuclei were crenated, the cell membranes were irregular, the most marked changes occurring in the cells of the periphery of the lobules (Figs. 69 and 70). In prolonged insomnia the striking changes in the liver were repaired by one seance of sleep.英文原著 · 《The Origin and Nature of Emotions》