EXPLANATION OF PLATES, III—IV. 
155 
Fig. 12. 
Fig. 13* 
Fig. 14. 
Fig. 15. 
Fig. 16. 
Verson’s cell (v) with surrounding small degenerating cells, taken from 
testis of imago. Killed with Flemming’s stronger solution and stained 
with rubin. (Leitz, Obj. 7, Oc. 4). 
Verson’s cell (v) with degenerating cells, taken from testis of imago after 
copulation. Treated as above. (Leitz, obj. 7, Oc. 4). 
Longitudinal section of terminal portion of ovarian tube, taken from larva 
in third stage, (z;) Verson’s cell. Treated with Flemming’s stronger 
solution and stained with Flemming’s saffranin solution. (Leitz, homog. 
imm. 1/12, Oc. 3). 
Testicular follicle of Papilio xuthus with Verson’s celj ( v ). Treated as 
above. (Leitz, Obj. 7, Oc. 4). 
Testicular follicle of wild silkworm with Verson’s cell ( v }. Treated as 
above. (Leitz, Obj. 7, Oc. 4). 
PLATE IV. 
All specimens killed with Flemming’s strong solution, except those shown in 
figs 63, 64, 82, 81 and 86. 
Fig. 17. Resting nuclei of primary germ-cells. («) nucleolus, consisting of chro¬ 
matin granules. Treated with Hermann’s triple staining. (Zeiss, homog. 
imm. 1/12. Oc 4.) 
Fig. 18. Two nuclei of same stage with greater portion of cell-bodies. Treated as 
above. (Zeiss, homog. imm. i/j 2, Oc. 5.) 
Fig. 19. Two primary germ-cells at beginning of skein stage. Treated as above. 
(Zeiss, homog. imm. 1/12, Oc. 4). 
Fig. 20. Five primary germ-cells, with their Nuclei at stage of segmented skein. 
In Nucleus represented at right hand side of figure chromosomes are 
much shortened. Treated as above. (Zeiss, homog. imm. 1/12, Oc. 4). 
Fig. 21. Stage of division of primary germ-cells. In left lower nucleus, seen from 
polar view, twenty-eight chromosomes can be distinctly counted. Treated 
as above. (Zeiss, homog. imm. 1/12, Oc. 5). 
Fig. 22. Primary germ-cells of more advanced stage of division. Twenty-six, or 
twenty-seven chromosomes are to be counted Jn polar views. Treated as 
above. (Zeiss, homog. imm. 1/12, Oc. 4). 
Figs. 23-45. Successive stages of metamorphosis of sperm-mother-cells in growing 
stage. P'igures 39, 40, 41, 42, and 43 are stained with Böhmer’s hæ- 
matoxylin, and all others with Hermann’s triple dyes. 
Fig. 23. Resting nuclei. These are very small in consequence of repeated divi¬ 
sions in last stage. (Zeiss, homog. imm. 1/12, Oc. 4). 
P'ig. 24. Resting nuclei at more advanced. (Zeiss, homog. imm. 1/12, Oc. 4). 
Figs. 25 and 26. Nuclei, before skein stage. Chromatin granules are collected 
irregularly at one side of nucleus. Nucleolus consists of small chromatic 
bodies. (Zeiss, homog. imm. 1/12, Oc. 4). 
Fig. 27. Skein stage. (Zeiss, homog. imm. 1/12, Oc. 4). 
Figs. 28, 28'. Granulation of chromosomes. (Zeiss, homog. imm. 1/12, Oc. 4). 
Fig. 29. More advanced stage as above. Here chromosomes are completely dest¬ 
royed. (ditto). 
