CONTENTS 
Page 
Physics. — The Growth and Decay op Photo-thermionic Currents prom 
Oxide Coated Fd^aments ... By H. D. Arnold and H. E. Ives 323 
Mathematics. — Group of Isomorphisms of a Transitive Substitution 
Group . By G. A. Miller 325 
Mathematics. — Einstein Static Fields Admitting a Group Gi of Continu- 
ous Transformations into Themselves . . By L. P. Eisenhart 328 
Mathematics. — Geometric Aspects of the Abelian Modular Functions 
of Genus Four (II) By A. B. Coble 334 
List of Publications of the National Academy of Sciences and of the 
National Research CouncHv: 
Part 1 . Publications of the National Academy of Sciences . 339 
Part 2. A Partial List of the Publications of the National 
Research Council 350 
Index 363 
