MAY 9 1922 

 [This is the Concluding Number of Volume LXJ 



PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LX, 1921. No. 4. 



CONTENTS 



PAGB 



Entelodonts from the Big Badlands of South Dakota in the Geologi- 

 cal Museum of Princeton University. By William J. Sinclair 467 

 On Mean Relative and Absolute Parallaxes. By Keivin Burns - - 496 

 The Nature and Origin of the Fishes of the Pacific Slope of Ecuador, 



Peru and Chili. By Carl H. Eigenmann ------- 503 



Measurement of Star Diameters by the Interferometer Method. By 



F. G. Pease ---------------- 524 



The Peopling of Asia. By Ales Hrdlicka -------- 535 



An Electro Chemical Theory of Normal and Certain Pathological 



Processes. By G. W. Crile ----------- 546 



The Coudersport Ice Mine. By Edwin Swift Balch - - - - 553 



Obituary Notices: Morris Jastrow, Jr. ---------- x 



Index ----------.-------,-- XXV 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 



1921 



