298 Sidney I. Korahai;ser, A. Coinparative Study of the Chromosomes etc. 
Fig. 2ü6. Late anaphase of first spermatocyte ; x passes to second spermatocyte a; 
// passes to second spermatocyte b. 
Fig. 207. Di\ision of second spermatocyte a of Figure 206, containing the x- 
component. 
Fig. 20S. The spermatids (a^ and a^) resulting from the division of a, Figure 207. 
Fach contains half of the x-component and is “female determining”. 
Fig. 209. Di\-ision of second spermatocyte b of Figure 206, containing the //- 
component. 
Fig. 210. The spermatids (b^ and b^) resulting from the division of b, Figure 209. 
Fach contains half of the y-component and is “male determining”. 
Figs. 211 — 222. Enchenopa curvaia. 
(Compare vcith Figures 200 — 210.) 
Diagrammatic representation of the behavior of the allosomes and autosomes 
during the grovvth period and divisions of the spermatocytes. The macrochromosome, 
one pair only of the smaller autosomes, the x-chromosome and the chi'omatic nucleoli 
are represented. 
.\s described in Part F (p. 284) of “Discussion”, solid black = “autochromatin”, 
white (i. e. outline only) = “x-chromatin”, small circles = “^-chromatin”, dots = linin. 
Fig. 211. Bouquet stage; x and chromatic nucleoh at the positive pole. 
Fig. 212. Löss of polar arrangement. Chromatic nucleoli connected to the autoso- 
some and to the x-chromosome. 
Fig. 213. The strepsistene stage. The chromatic nucleoli give up their substance 
to the autosomes. The linin fibers connecting the x-chromosome to the autosomes 
remain. 
Figs. 214 — 215. The formation of the autosome gemini. The x-chromosome is 
fully contracted. Linin fibers connect it to the autosome gemini. 
Fig. 216. Metaphase of first spermatocyte division. 
Fig. 217. Anaphase of first spermatocyte division. The .x-chromosome lengthencd 
in the direction of the a.xis of the spindle. Linin fibres connect it to the separating 
autosomes. 
Fig. 218. Late anaphase. x passes to one of the second spermatocjiies (a) un- 
divided. 
Fig. 219. Division of the second spermatocyte (a, Figure 218) vvhich contains 
the x-cliromosome. 
Fig. 220. The spermatids (a^ and a^) resulting from the division of a, Figure 219. 
Fach contains one half of x and is “female determining”. 
Fig. 221. Division of the second spermatocyte (b of Figure 218) vvhich contains 
no “x-chromatin”. 
Fig. 222. The spermatids (b^ andb®) resulting from the division of b, Figime 221. 
They contain no “x-chromatin” and are “male determining”. 
