304 KANSAS UNIVERSITY SCIENCE BULLETIN. 



ZOOLOGICAL LABORATORY. 



certain extent, of form, but form is more or less dependent 

 upon size. Size is a constant relation among the chromosomes, 

 therefore form, which is dependent upon size, would have a 

 tendency to be a constant. But it is not always a constant, 

 i. e., a chromosome which is usually a ring is not always a ring, 

 although it tends to be. This is probably due to external con- 

 ditions. Since this variation is encountered, form cannot be 

 essential; hence not an entirely reliable character upon which 

 to base individuality. 



I wish here to express my gratitude to Prof. C. E. McClung 

 for valuable suggestions and criticisms and for the helpful 

 encouragement that he has given me in the progress of this 

 work. 



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