298 
W. E. AG A If. 
Fig. 4. — Portion of a late prophase from a mesenchyme cell in the 
same larva. 
Fig. 5. — Anaphase, nerve-cell of same larva. 
Fig. 6. — Chromosomes ahont to he placed on the spindle. Muscle- 
cell, larva of stage 32 +. Sublimate-acetic. 
Fig. 7 . — Polar view of equatorial plate from same larva. Only a few 
of the chromosomes are shown. 
Fig. 8. — Chromosomes from various tissues of two larvae (stages 31 and 
31 -f ). Sublimate-acetic. 
Fig. 9. — Polar view of an unsplit equatorial plate of a spermatogonium. 
This is intact, in a 35 /i celloidin section. Sublimate-acetic. 
Fig. 10. — Portidn of anaphase of spermatogonial division. The two 
large chromosomes are partially overlying one another. Sublimate- 
acetic. 
Fig. 11.— Portion of late anaphase of spermatogonial division. 
Sublimate-acetic. 
PLATE 13. 
Fig. 12. — A i^air of daughter-plates of a small spermatogonial division. 
12 b has some chromosomes missing, 12 a is intact. The two plates were 
in the same 40 /u celloidin section, mounted between two cover-slips, and 
the figure was ol^tained by drawing the upper one from one side, then 
turning the slide over and di’awing the other one from the other side. 
The two large chromosomes are shown in 12 c, but one limb of one of 
tliem is vei'y much foreshortened. Sublimate-acetic. 
Fig. 13. — Portion of metaphase, first meiotic division. The large 
tetrad is not shown. Flemming. 
Fig. 14. — Pair of daughter-plates from a first meiotic division. Xot 
all the chromosomes are shown. Sublimate-acetic. 40 /t celloidin. 
Fig. 15. — Entire series of chromosomes from four nuclei of different 
stages : A. Spermatogonial daughter-plate. B. Tetrad rings just prior 
to formation of the equatorial plate of the first meiotic division, c. 
Metaphase, first meiotic division. D. Tetrads from daughter-plate of 
first meiotic division (the right-hand plate of fig. 14.) The nucleus a 
is intact in a 40 /i celloidin section. B, c and D are all cut in two 
sections, but probably in no case is any chromosome cut. In D one of 
the tetrads has evidently been carried away by the razor. In B and c 
the tetrads aie orientated as they would be if the spindle axis were 
parallel with the toj) edge of the page. * Shape of chromosome 
seriously affected by foreshortening, f Chromosome partially con- 
cealed by othei’ chromosomes, so that accuracy is not certain. (See 
fuller description in text, p. 291.) 
