. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology). . Fig. 10.—First division in egg of Cyclops, showing at one pole of spindle the granules which mark the germ path. (From Child, after Amma, by permission of University of Chicago Press), it was shown by Woods, many years ago, that the germ cells are definitely localized and recognizable, as shown in Figure 9. In some forms, notably the round-worm Ascaris, va- rious Crustacea and insects, the cells which are to become germ cells are visibly set apart from the very fi
. The biology of death; being a series of lectures delivered at the Lowell Institute in Boston in December 1920. Death (Biology). . Fig. 10.—First division in egg of Cyclops, showing at one pole of spindle the granules which mark the germ path. (From Child, after Amma, by permission of University of Chicago Press), it was shown by Woods, many years ago, that the germ cells are definitely localized and recognizable, as shown in Figure 9. In some forms, notably the round-worm Ascaris, va- rious Crustacea and insects, the cells which are to become germ cells are visibly set apart from the very first or one of the first three or four cleavages of the fertilized ovum. For example, in the case of the crustacean Cyclops, Amma has shown that the granules visible at one pole in the very first division mark the prospective germ path, as shown in Figure 10. In the gnat Chironomus the same thing is visible at a very early cleavage, according to the observations of Harper. For a comprehensive and critical review of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Pearl, Raymond, 1879-1940. Philadelphia, London, J. B. Lippincott Company
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