PROCEEDINGS 



OF THE 



American PhilosophiG;ai/Society 



HELD AT PHILADELPH:.". 



FOR PROMOTING USEFUL KNOWLEDGE 

 Vol. LVII. 1918. No. 2. 



CONTENTS 



PAGE 



A Critical Survey of the Sense of Hearing in Fishes. By G. H. Parker 69 



The Syriac Dialogue "Socrates." By Wm. Romaine Newbold . . 99 



Biochemical Studies of the Pitcher Liquor of Nepenthes. By Joseph 

 Samuel Hepburn 112 



Twin Hybrids from Crosses of CEnothera laniarckiana and franciscana 



with (E. pycnocarpa, in the Fi and F2. By George F. Atkinson 130 



The Art of George Catlin. By Edwin Swift Balch 144 



Parasitism among the Red Algae. By William Albert Setchell . 155 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 

 1918 



