All the figures (Philosamia cynthia) were drawn with the camera lucida. 
The enlargement is 2100 diameters, unless otherwise specified. 
PLATE 1 
EXPLANATION OF FIGURES 
1 Metaphase from cell of embryo, showing 26 chromosomes. 
2 Oogonial metaphase, showing 26 chromosomes. 
3 Prophase of first oocyte division, showing 13 chromosomes. 
4to7 Metaphasesof first oocyte division, side view, showing 13 chromosomes. 
8 Anaphase of first oocyte division, showing cell plate and chromosomes. 
9 Same; 13 chromosomes at each pole. 
10 and 11 Late first anaphase, oblique polar view. The upper groups of 
chromosomes enter the first polar body. 
12 to 14 Three sister anaphase groups of the first division; a, chromosomes 
of first polar body; b chromosomes remaining in the egg. 
30 
