CONTENTS. 



No. 1.— April, 1905. 

 Charles Zeleny, 



Compensatory Regulation. With 29 figures 1 



Amos W. Peters, 



Phosphorescence in Ctenophores 103 



Isabel McCracken, 



A Study of the Inheritance of Dichromatism in Lina Lapponica. With 

 1 plate and 3 figures in the text 117 



C. B. Davenport, 



Evolution without Mutation 137 



No. 2.— May, 1905. 



^ Edwin G. Conklin, 



Mosaic Development in Ascidian Eggs. With 82 figures 145 



C. W. Hahn, 



Dimorphism and Regeneration in Metridium. With 2 figures 225 



Charles G. Rogers, 



The Effect of Various Salts upon the Survival of the Invertebrate Heart. 

 With 1 plate 237 



C. M. Child, 



Studies on Regulation. VII. Further Experiments on Form Regulation 



jl^ in Leptoplana. With 34 figures 253 



^^'Naohide Yatsxj, 



The Fonnation of Centrosomes in Enucleated Egg-Fragments. With 8 

 figures 287 



