70L. XLVIII, HO. 573 SEPTEMBER, 1914 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Science! with 

 Special Reference to the Factors of Evolution 



Studies on Inbreeding. Dr. Raymond Pearl - - - 

 The Chromosome Hypothesis of Linkage applied to Cases in Sw 



Primula. Calvin B. Bridges 



The Reduplication Hypothesis as applied to Brosophila. 



Pattern Development in Mammals and Birds. Dr. Glover M. 



THE SCIENCE PRESS 

 ULNOASTER, PA. GARRISON, N. T. 



NEW TOSS: 8ITB-STATI0N 84 



