DEC 1 fo^o 

 PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LXI. 1922. 



No. 3. 



CONTENTS 



PAGE 



Discussion Of a Kinetic Theory of Gravitation, II; and Some New 



Experiments m Gravitation. By Charles F. Brush - - - - 167 



Lithology of the White River Sediments. By Harold R. Wanless - 184 

 Yellow Fever and Fishes. By C. H. Eigenmann - -,----- 204 

 Arc Spectra and Ionization Potentials in Dissociated Gases. By K 



T. COMPTON - - - - _ 



" " " - - - - - 212 



Manna, Nectar, and Ambrosia. By Paul Haupt ------ 22-] 



Application of Biophysical Research to Medical Problems. By G 



W. Crile and Hugo Fricke - - - - 



------- 237 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 



1922 



