CONTENTS 
Page 
Physics. — ^The Stark Effect in Helium and Neon , . . By Harry Nyquist 399 
Geochemistry. — New Analyses of Echinoderms . By F. W. Clarke and R. M. Kamm 401 
Genetics. — On Utilizing the Facts of Juvenile Promise and Family History 
''in Awarding Naval Commissions to Untried Men . ByC.B. Davenport 404 
Physics. — The Triplet Series of Radium 
By Gladys A. Anslow and Janet T. Howell 409 
Physics. — The Measurement of Small Angles by Displacement Interfer- 
ometry ByCarlBarus 412 
Pathology. — Mechanisms that Defend the Body from Poliomyelitic Infec- 
tion, (a) External or Extra-Nervous, (b) Internal or Nervous . . . 
By Simon Flexner 416 
Chemistry.^The Behavior on Hydrolysis of the Simplest Secondary Nu- 
cleoside ON Thymine . ... By Treat B. Johnson and Sidney E. Hadley 418 
Physics. — The Occurrence of Harmonics in the Infra-Red Absorption Spec- 
tra of Diatomic Gases . . . By James B. Brinsmade and Edwin C. Kemble 420 
- Physics. — The Loss in Energy of Wehnelt Cathodes by Electron, Emission 
By W.Wilson 426 
Agriculture. — Daily Variation of Water and Dry Matter in the Leaves 
OF Corn and the Sorghums . . By Edwin C. Miller 427 
Physics. — Note on Complementary Fresnellian Fringes . . ByCarlBarus 432 
Physics. — ^The Displacement Interferometry of Long Distances .... 
By Carl Barus 436 
National Research Council. — Meetings of the Executive Council . . . 438 
. Joint Meeting of the Executive, Military, and Engineering Com- 
mittee 443 
