588 ROBERT T. HANCE 



Seiler, J. 1914-1915 Das Verhalten der Geschlechtschromosomen bei Lepido- 



teren. Arch f. Zellf., 13. 

 Stevens, N. M. 1910 The chromosomes in the germ cells of Culex. Jour. 



Exp. Zool., vol. 8. 



1911 Further studies on the heterochromosomes in mosquitoes. Biol. 



Bull., 20. 

 Taylor, Monica 1915 The chromosome complex of Culex pipiens. Quart. 



Jour. Mic. Sc, 60. 

 Wieman, H. L. 1913 Chromosomes in man. Am. Jour. Anat., 14. 



DESCRIPTION OF PLATES 



All the figures are reproduced at a magnification of approximately 4500 X . 

 All the drawings were made from the Flemming preparations, except figure 29. 

 which was taken from tissue fixed in P. F. A. No. 3. The drawings are all taken 

 from nerve tissue except figure 29, which is from a limb bud. 



PLATE 1 



EXPLANATION OF FIGURES 



1 Prophase showing only three threads. This cell is the product of poor 

 fixation. 



3 to 16 Prophase stages. 



17 to 20 Metaphase stages, polar view. 



