I I9I6' 

 PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LIV. October-December, 1915. No. 220. 



CONTENTS 



Symposium on the Earth ; Its Figure, Dimensions and the Constitu- 

 tion of its Interior : 



IV. Variations of Latitude: Their Bearing upon our Knowledge 



of the Interior of the Earth. By Frank Schlesinger - 351 



A Practical Rational Alphabet. By Benjamin Smith Lyman - - - 359 



The Cambrian Manganese Deposits of Conception and Trinity Bays, 



Newfoundland. By Nelson C. Dale - - - - 37 1 



Minutes --------------- xiii 



Index ------ xvii 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



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