CONTENTS 
1910 
No. 1. SEPTEMBER 
Biography. William Keith Brooks : A sketch of his life by some of his former 
pupils and associates. Three portraits 1 
Edmund B. Wilson. Studies on chromosomes. Five figures 53 
George Lefevre and W. C. Curtis. Reproduction and parasitism in the 
Unionidae. Thirty-nine figures, five plates 79 
Otto C. Glaser. The nematocysts of Eolids. Twelve figures 117 
Albert H. Tuttle. Mitosis in Oedogonium. Eighteen figures 143 
J. PlayfairMcMurrich. The genus Arachnactis. Five figures 159 
Francis H. Herrick. Life and behavior of the cuckoo. Twenty-three 
figures, seven plates 169 
No. 2. OCTOBER 
E. A. Andrews. Conjugation in the crayfish, Cambarus affinis. Eight 
figures 235 
S. O. Mast. Reactions in Amoeba to light. Two figures 265 
H. S. Jennings. What conditions induce conjugation in Paramecium? Four 
figures 279 
M.M. Metcalf. Studies upon Amoeba. Forty-five figures 301 
Samuel Rittenhouse. The embryology of Stomotoca apicata. Thirty-two 
figures 333 
A. M. Reese. The lateral line system of Chimaera colliei. Eighteen figures . . . 349 
Edwin Linton. On a new Rhabdocoele commensal with Modiolus plicatulus. 
Forty-one figures. 371 
