442 
George Arnold 
to fill up a far larger part of the nuclear cavity than in the corre- 
sponding stage in the ovigenesis (e, f Figs. 8 and 31). 
But it is even easier to ascertain here, wliat is already suffici- 
ently evident in the oocytes, that the spireine consist of eiglit sepa- 
rate segments, and which during the synapsis, show the longitudinal 
split most clearly. Fig. 30 seems almost diagrammatic, so clear is 
the split in eacli segment, but it is a faithful and not in the least 
exaggerated picture. After the synapsis, the segments separate and 
lie loosely in the nucleus. I have given no illustrations between this 
stage and the late prophase, as such would be merely wearisome 
repetitions of figures which are to be seen in a vast number of papers 
on Spermatogenesis. 
Fig. 32 represents the spermatocyte, shortly before the nuclear 
membrane begins to disappear. Here for the first time is noticed a 
chromatic body (cb) in the cytoplasm surrounded 
by a clear area. It is stained a deep purple blue 
by the Methylene Blue. The centrosomes are 
visible at this stage, but are very minute. They 
^ are surrounded by a clear area, faintly indicated 
" in the figure. It is not possible, owing to their 
extreme minuteness to make sure of their shape, 
and although it cau be seen that they are not 
spherical, yet I have not seen them as double 
bodies as figured by Schleip. 
In this late prophase, it is quite clear that there are 8 gemini. 
In some gemini traces of the split may still be seen. and in Fig. 33 
is seen one, which is twisted on itself, and the free ends of which 
are distinctly split. 
When the gemini are on the equatorial plane (Fig. 34a) they 
present three different shapes. There are always two rings, and at 
least two like C 1; but I have not been able to satisfy myself 
0 
0 
1 
i 
Fi- 1. 
whether the other four gemini are all of the tetrad shape (Fig. B 1) 
as form C 2, is very similar to a tetrad in which the univalent halves 
are free at their ends (B 3). 
The metaphase shows no remarkable features and therefore is 
not figured. The division is transverse, separatiug the univalent 
chromosomes to each pole. The Ist. meiotic division is therefore a 
reducing division. 
Fig. 35 represents the telophase. The daughter chromosomes of 
the Ist. meiotic division can no longer he distinguished individually. 
