vol. i, so. m 



MARCH, 1916 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Sciencei with 

 Special Eeference to the Factors of Evolution 



he Rate of Evolution In Angiosperms. Professor Edward 



C. Jeffrey - 



n. A Further Analysis of the Hereditary Transmission of Degeneracy end De- 

 formities by the Descendants of Alcohollaed Mammals U: Dr. 



Charles R. Stockard aud George Papanicolaou - 

 in. Bhorter Articles and Discussion: Variability under Inbreeding and Crossbreed- 

 ing: Professor W. E. Castle --------- i 



IV. Notes and Literature: Poulton on Mimicry in Butterflies: Professor JoHir H. 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, N. Y. 



NEW YORK : SUB- STATION 84 



