Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXII. No. 4. — Dfxembkr, ISOG. 



COXTRIRUTIONS FROM THE ZOOLOGICAL LABORATORY OF 

 THE MUSEUM OF COMPARATIVE ZOOLOGY AT HAR- 

 VARD COLLEGE, E. L. MARK, DIRECTOR, No. LXXIII. 



STUDIES IN MORPHOGENESIS, VI. 



A CONTRIBUTION TO THE QUANTITATIVE STUDY OF CORRE- 

 LATED VARIATION AND THE COMPARATIVE 

 VARIABILITY OF THE SEXES. 



By C. B. Davenport and C. Bullard. 



fP.f' 



