570 
K. RUGGLES GATES AND NESTA THOMAS. 
showing 15 chromosomes. Some of the chromosomes are losing some of 
their chromatin, a trail of which is left on the spindle as the chromo- 
somes pass to the poles. 
Fig. 38. — Normal metaphase of homotypic division, one spindle in 
polar view and one in profile, showing the 8-7 distribution of chromo- 
somes. 
Fig. 39. — Normal homot 3 rpic metaphase, oblique view showing 7-8 
distribution of chromosomes, in several of which the split may be seen. 
Fig. 40. — Polar view of the two homotypic metaphase groups in 
a mother-cell. The lower group contains 8 whole and one A 
chromosomes, though the former vary in size. The upper group con- 
tains 6 whole and one A chromosomes, S indicates the halves of 
the chromosome which split at the heterotypic metaphase. 
Fig. 41 a and h . — Irregular distribution of chromosomes. Polar view 
of one group of chromosomes at the homotypic metaphase, showing 9 
chromosomes. The second spindle, having only 6 chromosomes, is 
seen in profile in two sections. 
PLATE 37. 
(E. near Lamarckiana. 
Fig. 42. — Heterotypic spindle in profile, showing 14 chromosomes. 
Two of the chromosomes are leaving a trail of chromatic substance as 
they move towards the pole. 
Fig. 43. — Normal homotypic metaphase with two groups of 7 
chromosomes. 
Fig. 44. — Irregular homotypic metaphase. In the left-hand group 
there are probably 7 whole and one A chromosomes, while the right- 
hand group contains apparently 6 whole and one A chromosomes. 
This indicates that one of the 14 chromosomes has split on the 
heterotypic spindle, though there is great variation in the size of the 
chromosomes. 
Fig. 45. — Late anaphase of second division, showing the four anaphase 
groups, each with 7 chromosomes. 
(E . mutant resembling lata. 
Fig. 46. — Normal heterotypic spindle in profile, showing 15 chromo- 
somes scattered on the spindle. 
Fig. 47, — Irregular heterotypic anaphase with 9 chromosomes moving 
to one pole of the spindle and 5 to the other. The fifteenth chromosome 
lias been pulled into two parts, leaving a chain of chromatin between 
them. 
