CONTENTS 
Transactions : 
Page. 
Annual Address by the President : 
“Social Science,” 
Dr. Milton Brocket! Porter 5-13 
“Instincts and Habits illustrated by Solitary Wasps,” 
Carl G. Hartmann 15-85 
“The Effect of Tension on the Development of 
Mechanical Tissues in Plants,” 
0. M. Ball, Ph. D | 87-97 
“The Vegetation of the Sotol Country in Texas,” 
Dr. William L. Bray ....:, 99-122 
Proceedings : 
Officers for 1903-1904 >. 3 24 
Titles of Papers Bead Before the Academy from January 
1, 1904, to December 2, 1904 125-126 
List of Patrons and Fellows 127-128 
List of Members 128-130 
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