134 
Thos. H. Moiitgomery, jr. 
Testis no. lüö. 
Chromosomal Variation just as in the preceding, 3 out of 25 fii'st 
spermatocytes having 9 instead of 8 separate elements. All 47 second 
spermatocytes exhibitcd 7 elements. 
Testi s 110 . 286. 
Another case like testis no. 282, 6 out of 76 first spermatocytes having 
9 instead of 8 separate elements. Of 202 second spermatocytes all but 
1 showed 7 separate elements ; the exception is exhibited in fig. 60, PL X, 
and is due to lack of conjugation of the diplosomes (the only instance 
found of such an abnormality in any of the testes), for the smaller diplo- 
some (d) lies by itself and not in Opposition to the larger. 
Testis no. 103. 
All 10 spermatogonia showed 14 chromosomes. 45 first sperma- 
tocytes showed each 8 elements, just as in testis no. 282, while 1 showed 
10. In the latter exceptional case (fig. 59, PI. X) 4 elements, those lettered 
s, appeared of less depth than the others and made up two pairs, the 2 of 
each pair being of equal volnmes. This is readily explained as a case where 
the univalent components of 2 of the normally bivalent autosomes have 
jirecociously separated or have failed to conjugate. 51 second sper- 
matocytes exhibited each the normal condition of 7 separated elements, 
but 1 showed 8; the latter case (fig. 61) shows an additional minute ele- 
nient (a:) smaller than the smaller diplosome {d) and I canuot explain its 
presence for nothing like it was found in any other ceU of this testis; may 
it have been a yolk globale, for in this preparation yolk globales were not 
differentiated by staining from chromosomes? 
Testis no. 120. 
This individual exhibited more complicated Variation than the others, 
due to occasional presence of minute supernunierary elements. 
4 spermatogonia showed each 14 chromosomes (fig. 38, PI. X), the 
smallest being the smaller diplosome (d). 4 others showed distinctly 15 
each (fig. 39); the additiojial niember would appear to be that one a little 
larger than the smaller diplosome, as we may conclude from a comparison 
of them in the later stages: and these later stagcs also indicate that some 
of the spermatogonia may have 16 elements though I have never found 
this number with certainty (vide infra). 
