2Fn :^emoriam 
WILLIAM KEITH BROOKS 
1848-1908 
THE JOURNAL 
OF 
EXPERIMENTAL ZOOLOGY 
EDITORIAL BOARD 
\\'ii>LiA.\i E. Castle 
Harvard University 
Edwin G. Conklin 
Princeton University 
CuARLEs B. Davenport 
Carnegie Institution 
Horace Javne 
The Wistar Institute 
Herbert S. Jennings 
Johns Hopkins UnivprsiJv 
Frank R. Lillie 
University of Chicano 
Jacques Loeb 
The Rocliefeller Institute 
ThomXs H. Morgan 
Columbia University 
i^-" George H. Parker 
Harvard University 
Charles O. Whitman 
University of Chicago 
Edmund B. Wilson, Columbia University 
and 
Ross G. Harrison, Yale. University 
Managing Editor 
VOL. 9 No. 2 
OCTOBER, 1910 
PUBLISHED EIGHT TIMES A YEAR BY 
THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 
36th STREET AND WOODLAND AVENUE 
PHILADELPHIA, PA. 
Entered as second-class matter May 28, 1909, at the Post Office at Philadelphia, Pa., under Act of March 3, 1879 
