. Biology in America. Biology. The Organization of the Egg 189 the generally accepted doctrine of piefoniialion, according to which the adult animal was present in miniature within the egg or the sperm cell, both of which had their advocates, so that embryologists were divided into the rival schools of "ovists" and "; One enthusiastic and imagina- tive observer even pictured a miniature human body within the spermatozoon. sp. BERoii Showing tlie four rows of swiinuiing ]>lntes, sj Chun. Vrom Lankosfcr, after While such fancies have long since been laid to res
. Biology in America. Biology. The Organization of the Egg 189 the generally accepted doctrine of piefoniialion, according to which the adult animal was present in miniature within the egg or the sperm cell, both of which had their advocates, so that embryologists were divided into the rival schools of "ovists" and "; One enthusiastic and imagina- tive observer even pictured a miniature human body within the spermatozoon. sp. BERoii Showing tlie four rows of swiinuiing ]>lntes, sj Chun. Vrom Lankosfcr, after While such fancies have long since been laid to rest, pre- formation, in a new dress, is playing a very important role on the biological stage today. The importance of this theory is due largely to the work of two American biologists— Morgan at Columbia and Conklin at Princeton. In modern form preformation assumes the presence in the sex cells of certain formative stutfs or entities (more exact terminology is impossible in the present state of our knowl- edge) which determine the development of parts or features of the adult organism. These things, whatever they are, may reside either in the nucleus or the cytoplasm. In the former. 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 Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
Size: 1186px × 2106px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcontributor, bookpublisherbostonrgbadger, booksubjectbiology
