PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. Llil. January— April, 1915. No. 216. 



CONTENTS 



The Problem of Adaptation as Illustrated by the Fur Seals of the 

 Pribilof Islands. By George H. Parker - - - - i 



The Large Fruited American Oaks. By William Trelease - 7 

 The Swedes, Governor Printz and the Beginning of Pennsylva- 

 nia. By Thomas Willing Balch - - - - - - 12 



General Results of the Work in Atmospheric Electricity Aboard 

 the Carnegie, 1 909-1 9 14. By L. A. Bauer - - - -14 



The Rights and Duties of Neutralized Territory. By Charle- 

 magne Tower - - - 18 



The Pronouns and Verbs of Sumerian. By J. Dyneley Prince 2'] 

 The Hall and Corbino Effects. By E. P. Adams - - - 47 

 Some Results from the Observation of Eclipsing Variables. By 

 Raymond S. Dugan - - - -- - - -52 



Some Present Needs in Systematic Botany. By L. H. Bailey 58 

 The Variable Stars TV, TW, TX Cassiopeiae and TLeonis Minoris. 

 By R. J. McDiarmid - _ _ _ _ . . .66 



An Interpretation of Sterility in Certain Plants. By E. M. East 70 



Minutes - - - - - - i 



Obituary Notices of Members Deceased - - - - - i 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL, SOCIETY 



104 South Fifth Street 



1915 



