mack: dimensions of chromosomes. 127 



I wish to express my appreciation to Dr. C. E. McClung for 

 starting me on this material and to Prof. W. J. Baumgartner for 

 suggestions and for the kindly interest shown in the work. I am 

 also indebted to Dr. T. C. Frye for permitting me to use a room 

 in the Puget Sound Marine Station. 



Since this paper has been sent to the publisher new papers 

 have appeared by Meek on "A Further Study of the Metotic 

 Spindle in the Spermatocytes of Forficula auricularia," in which 

 he says that "new evidence before us shows us that the previous 

 proposition put forward can not be universal," and that, "so far 

 cytometrical investigations seem to have yielded only negative 

 generalizations," thus agreeing with our results. 



3— Univ. Sci. Bull., Vol. IX, No. 10. 



