. Journal of experimental zoology. from beginning of experiment. For description see text. interpenetrated by a chromaticnetwork. Eggs in which theectoplasm has been attractedinto the interior apparently donot develop farther. When the ectoplasm remainsexternal the chromatic partof the nucleus is drawn to 62 illustrates a case inwhich there were two accumu-lations of the ectoplasm onopposite sides of the egg; theattraction acting on the nucleushas drawn the latter out intoa broad band extending from the ectoplasmic spherules,which are thus completely. Fig. 63. History same as 62. For d
. Journal of experimental zoology. from beginning of experiment. For description see text. interpenetrated by a chromaticnetwork. Eggs in which theectoplasm has been attractedinto the interior apparently donot develop farther. When the ectoplasm remainsexternal the chromatic partof the nucleus is drawn to 62 illustrates a case inwhich there were two accumu-lations of the ectoplasm onopposite sides of the egg; theattraction acting on the nucleushas drawn the latter out intoa broad band extending from the ectoplasmic spherules,which are thus completely. Fig. 63. History same as 62. For description seetext. one mass of ectoplasm to the other. The chromatic portion of thenuc eus is next the ectoplasm on each side, leaving an achromaticnuclear band in the center. The chromatin is broken up into smallparticles which are scattered between the ectoplasmic spherules. Eletnentary Phenomena of Embryonic Development 231 A single section, such for instance as is shown in Fig. 63, showsthe outhne of the nucleus still intact; the chromatin in strandswith large varicosities is seen stretching off toward the main massof the ectoplasm, and the farther we trace it from the center of thenucleus the more the chromatin is broken up; radiating lines ofgranules can be seen extending from larger masses ot chromatin inbetween the ectoplasmic spherules, so that all intermediate stagesbetween masses of chromatin and scattered microsomes may beseen. Many similar sections occur on the same slides. Suchgranules are very much less abundant between the ectoplasmic
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1904
