Archive image from page 31 of Cytology, with special reference to. Cytology, with special reference to the metazoan nucleus cytologywithspec00agar_0 Year: 1920 16 CYTOLOGY chap. so that the same microscopical picture is interpreted by one cytologist as vacuolation, by another as the unravelling of a single twisted thread, and by a third as the intertwinings of two threads. Thus, even in the most obvious cases of thread formation, this is always accompanied by irregularities in the thickness and in the distribution of the conspicuous u Fig. 8. Root tips of Allium cepa. (A, B, C, after Deho
Archive image from page 31 of Cytology, with special reference to. Cytology, with special reference to the metazoan nucleus cytologywithspec00agar_0 Year: 1920 16 CYTOLOGY chap. so that the same microscopical picture is interpreted by one cytologist as vacuolation, by another as the unravelling of a single twisted thread, and by a third as the intertwinings of two threads. Thus, even in the most obvious cases of thread formation, this is always accompanied by irregularities in the thickness and in the distribution of the conspicuous u Fig. 8. Root tips of Allium cepa. (A, B, C, after Dehorne, , 1911 ; D, E, after Bonnevie, , 1908; F, G, after Gregoire, , 1906.) A, D, F, telophase; C, E, G, prophase; B, resting nucleus. chromatin along the inconspicuous linin basis of the thread, and also by outgrowths and anastomoses, which are generally sufficient to conceal entirely in the resting nucleus its essential construction out of compara- tively few long threads. The same factors, acting in telophase at a still earlier stage of thread formation, may easily conceal the true nature of this process, and convert what is essentially an irregular and twisted thread into the appearance of a reticulum. On the other hand, the early
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