PROCEEDINGS 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LIII. August— December, 19 14. No. 215. 



CONTENTS 



The Vegetation of the Sargasso Sea. By William G. Farlow - 257 



The Kinetic System. By George W. Crile . . . . 263 



Newer Aspects and Methods in the Study of the Mechanism of the 



Heart-beat. By Alfred E. Cohn - - - - - 287 



The Use of a Photographic Doublet in Cataloging the Positions of 



Stars. By Frank Schlesinger _ . . . _ 303 



Some Observations on the Psychology of Jurors and Juries. 



By Patterson DuBois ------- 307 



On the Production of an Artificial Hiss. By E. B. Titchener - 323 



Minutes .-.-_. xvii 



Index ------ xxiii 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 

 104 South Fifth Street 



1914 



