VOL. ZLH, NO. 502 



OCTOBER, 1008 



THE 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 

 DEVOTED TO THE NATURAL SCIENCES 

 IN THEIR WIDEST SENSE 



CONTENTS 



Page 



I. The Manifestations of the Principle! of Chemical Mechanics in the Living 



Plant. DR. F. F. BLACKMAN 633 



II. The Desiccation of Rotifers. D. D. WHITNEY 665 



III. On the Habits and the Pose of the Sauropodous Dinasaura, especially of 



Diplodocns. DR. OLIVER P. HAY 672 



IV. Shorter Articles and Correspondence: Juvenile Substitutes for smoking 



Tobacco. Professor William Albert Setchbll 682 



V. Notes and Literature : Heredity— Recent Studies in Human Heredity, Dr. 

 F. A. Woods. Ornithology— Riddle on the Cause of the Production of 

 Down and Down-like Structures in the Plumages of Birds, J.A.A. VertebraU 

 Paleontology- -New Fossil Mammals from Egypt, T. D. A. C. . . . 686 



THE SCIENCE PRESS 

 LANCASTER, FA. GARRISON, N. T. 



NEW YORK : SUB-STATION 84 



