viii CONTENTS 
PAGE 
Encephalitis and PoliomyeivITis By Simon Flexner 103 
Leptospira Icteroides and Yellow Fever By Hideyo Noguchi 110 
Human Retinal Adaptation By Selig Hecht 112 
On the Mechanism of Fever Reduction by Drugs 
By Henry G. Barbour and Julian B. Hermann 136 
Thermokinetics of Liometopum Apiculatum Mayr By Harlow Shapley 204 
The Effect of Anesthetics on Living Cells 
By Grade Medes and J. F. McClendon 243 
The Carbon-Dioxide: Heat Ratio in Cattle 
By H. P. Armshy, J. August Fries, and Winifred W. B aman 263 
The Dynamics of a Fluctuating Growth Rate By H. S. Reed 397 
Are the Superior Cervical Ganglia Indispensable to the Maintenance 
OF Life? By S. J. Meltzer 532 
Observations on the Body Temperature of Dry Cows By Max Kriss 539 
Blood Concentration Changes in Influenza 
By Frank P. Underhill and Michael Ringer 692 
ANTHROPOLOGY AND PSYCHOLOGY 
Central American Calendars and the Gregorian Day 
By Herbert J. Spinden 56 
Anthropometry of the Siouan Tribes By Louis R. Sullivan 131 
A Study of the Persistence of Vision By A. C. Hardy 221 
The Influence of Environment upon Development By Franz Boas 489 
