CONTENTS 
ix 
PAGE 
Mechanisms that Defend the Body from Poliomyelitic Infection, (A) External 
OR Extra-Nervous, (B) Internal or Nervous By Simon Flexner 416 
On the Role of the Thymus in the Production of Tetany By Eduard Uhlenhuth 517 
Heliotropic Animals as Photometers on the Basis of the Validity of the Bun- 
sen-Roscoe Law for Heliotropic Reactions 
By Jacques Loeh and John H. Northrop 539 
On the Non-Existence of Nervous Shell-Shock in Fishes and Marine Inverte- 
brates By Alfred Goldsborough Mayer 597 
Chemical Differentiation of the Central Nervous System in Invertebrates 
By A.R. Moore 598 
Proof of the Muscle Tension Theory of Heliotropism By Walter E, Garrey 602 
Is Death from High Temperature Due to the Accumulation of Acid in the 
Tissues? By Alfred Goldsborough Mayer 626 
The Effect of Stretching on the Rate of Conduction in the Neuro-Muscular 
Network in Cassiopea By J. F. McClendon 703 
The Effect of Oxygen Tension on the Metabolism of Cassiopea 
By J. F. McClendon 715 
ANTHROPOLOGY AND PSYCHOLOGY 
Archaeology of Mammoth Cave and Vicinity: A Preliminary Report 
By N. C. Nelson 192 
ZuNi Chronology By Leslie Spier 280 
A Design-Sequence from New Mexico By A. V. Kidder 369 
The Mesa Verde Types of Pueblos By J. Walter Fewkes 497 
Appetites and Aversions as Constituents of Instincts By Wallace Craig 685 
