CONTENTS 
Page 
Genetics. — Structural Changes Associated with Factor Mutations and 
WITH Chromosome Mutations in Datura ..... 
By E. W. Sinnott and A. F. Blakeslee 17 
Mathematics. — The Riemann Geometry and Its Generalization 
By L. P. Eisenhart and 0. Veblen 19 
Mathematics. — Ricci's Principal Directions for a Riemann Space and the 
Einstein Theory . . . . . . By L. P. Eisenhart 24 
Mathematics. — ^Note on the Definition of a Lineal Functional 
By C. A. Fischer 26 
ZodLOGY. — Skin Tilansplantation in Frog Tadpoles . By W. H. Cole 29 
