VOL. XLIV, MO. 526 



OCTOBER, 1910 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 Deroted to the Advancement of the Biological Science! with 

 Special Reference to the Factors of Evolution 



CONTENTS 



Pagt 



I. Variations in Urosalpinx, Dr. Herbert Eugene Walter - - - - 517 

 II. Nuclear Phenomena of Sexual Reproduction in Qymnosperms. Charles J. 



III. Nuclear Phenomena of Sexual Reproduction in Angiosperms. Professor D. 



IV. snorter Articles and Discussion: Sterility, Dr. Max Morse - - - - 624 

 V. Notes and Literature: Note* on Ichthyology President, David Starr Jordan. 



The Mammals of Colorado, Professor T. D, A. Cockerell - - - - 634 



THE SCIENCE PRESS 



LANCASTER, PA. OAREISON, W. T. 



NEW YORK : STJB -STATION 84 



