VOX. XLU. 50. 493 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 DEVOTED TO THE NATURAL SCIENCES 

 IN THEIR WIDEST SENSE 



CONTENTS 

 mdate Amphibia. DR. EOT L. MOODIE. 

 their Relationship to Other Organisms. Professor 



HENRY B. WARD 



in. The Faunal Affinities of the Prairie Region of Central North America. DR. 



ALEXANDER G. RUTHVEN 



IV. Physiology. Professor FREDEEIC S. LEE 



V. Notes and Literature : ifomctrte— Recent Contributions to Theory, Professor 

 Raymond Pearl. Prototoa— Some Amoeba Studies, G. N. C. Expert- 

 mental Zoology— Regeneration, M. Parasitology— A Chinese Parasite, B.W. 



THE SCIENCE PRESS 

 LANCASTER, PA. GARRISON, N. T. 



NEW YORK : SUB-STATION 84 



