CONTENTS 
Page 
G^oi^OGY. — DiPPERENTiATiON BY Deformation ...By N. L. Bowen 159 
Genetics. — The EvroENCE for the Linear Order of the Genes 
By T. H. Morgan, A. H. Sturtevant, and C. B. Bridge 162 
Genetics. — The Arrangement of Genes in Drosophila Virii^is 
By C. W. Metz 164 
Physics. — The Functions of Intensity and Phase in the Binaural Location 
of Pure Tones. By G. W. Stewart 166 
Physics. — The Measurement of Small Time Intervals and Some Applica- 
tions, Principally Ballistic 
By L. T. E. Thompson, C. N. Hickman, and N. Riffolt 169 
Physics. — Charcoal Activation By B. H. H. Sheldon 178 
Mathematics. — The Starting of a Ship By James K. Whittemore 182 
Mathematics. — A Thermodynamic Study of Electrolytic Solutions 
By F. L. Hitchcock 186 
Botany. — The Formation of the Cell Plate in the Cambium of the Higher 
Plants By Irving W. Bailey 197 
Mathematics. — Functionals Invariant under One-Parameter Contin- 
uous Groups of Transformations in the Space of Continuous Func- 
tions By I. A. Barnett 200 
I*hysiology. — ^Thermokinetics of Liometopum Apiculatum Mayr 
By Harlow Shapley 204 
Chemistry. — The Influence of Ions on the Osmotic Pressure of Solutions 
By Jacques Loeb 211 
Zoology. — Evidence on the Nature of Nuclear Activity 
By D. H. Tenm Ml 
Psychology. — A Study of the Persistence of Vision By A. C. Haniy 221 
Genetics. — ^A Contribution of Genetics to the Practical Breeding of 
Dairy Catti^e By R. Pearl 225 
