TOl. XLIX, HO. 477 



JANUARY, 191S 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Science! with 



Special Reference to the Factors of Evolution 



I. Some Fundamental Morphological Objections to the Mutation Theory of De 

 Vrles. Professor Edward C. Jeffrey ------- 



H. The English Rabbit and the Question o 

 Professor W. 7 

 HI. On the Number of Rays in Asterias t 



W. J. Cbozieb 



IV. Shorter Articles and Discussion : Mr. Muller on the Constancy of Mendelian 

 Characters: Professor W. E. Castle. No crossing over of the Female of 

 . J..F-.ANT. The Influence of Position in 



THE SCIENCE PRESS 



XaANOASTEE, PA. GAREISON, N. T 



NEW YORK : SUB-STATION 84 



