VOL. XLIII, HO. S76 



DECEMBER, 1914 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Science! \ 

 Special Reference to the Factors of Evolution 



CONTENTS 



The Failure of Ether to Produce Mutations la Drosophi" 



The Analysis of a Case of Continuous vai 

 of Its Linkage Relations. Professor J o 

 Shorter Articles and Correspondence : On the P 



zygousBrother^isterMatings. H. D. FrsH - 

 Notes and Literature: Mendelian Fluctuations: G.U 



n in Drosophila by a Study 



THE SCIENCE PEESS 

 LANCASTER, PA. GABRISON, H. T. 



NEW YORK: SUB-STATION 84 



