CONTENTS 
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. From the Zoological Laboratory, 
Columbia University. Five figures 53 
George Lefevre and W. C. Curtis 
Reproduction and parasitism in the Unionidae. From the 
Zoological Laboratory, University of Missouri. Thirty- 
nine figures, five plates 79 
Otto C. Glaser 
The nematocysts of Eolids. From the Zool. Lab., Univer- 
sity of Michigan. Twelve figures 117 
Albert H. Tuttle 
Mitosis in Oedogonium. From the Dept. Biol., University 
of Virginia. Eighteen figures 143 
J. Playfair McMurrich 
The genus Arachnactis. From the Anat. Lab., University 
of Toronto. Five figures 159 
Francis H. Herrick 
Life and behavior of the cuckoo. From Adelbert College, 
Western Reserve U. Twenty-three figures, seven plates. 169 
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