CONTENTS 



1912 



No. 1 JULY 5 



C. B. Davenport. Sex-limited inheritance in poultry. Eight colored 



plates 1 



T. H. Morgan. Heredity of body color in Drosophila. Four figures (color 



plate) 



27 



George Alfred Baitsell. Experiments on the reproduction of the hypo- 

 trichous Infusoria. I. Conjugation between closely related individuals 

 of Stylonychia pustulata. Twenty figures (one plate) 47 



T. H. Morgan and Eleth Cattell. Data for the study of sex-linked in- 

 heritance in Drosophila 79 



C. M. Child. Studies on the dynamics of morphogenesis and inheritance 

 in experimental reproduction. IV. Certain dynamic factors in the 

 regulatory morphogenesis of Planaria dorotocephala in relation to the 

 axial gradient. Forty-six figures 103 



No. 2 AUGUST 20 



Raymond Pearl. The mode of inheritance of fecundity in the domestic 



fowl. Three figures ^^^ 



W. C. Allee. An experimental analysis of the relation between physiologi- 

 cal states and rheotaxis in Isopoda. Ten figures 269 



iii 



