VOL. L, HO. 589 



JANUARY, 1816 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Devoted to the Advancement of the Biological Sciences with 

 Special Reference to the Factors of Evolution 



I. The Evolution of the Cell. The Late Professor E. A. Minchin - 

 H. The Eugster Gynandromorph Bees. Professor T. H. Morgan - 

 m. Shorter Articles and Discussion: Pink-eyed White Mice, carrying the Color 

 Factor. Dr. J. A. DETLEF8EN. Parthenogenesis and Sexual Reproduction in 



Rotifers. Dr. D. D. Whitney 4 



IV. Books and Literature: An Outline of Current Progress in the Theory of Cor- 

 relation and Contingency. Dr. J. ARTHUR Harris __-_-) 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, N. T. 



NEW YORK: SUB STATION 84 



