PROCEEDINGS 



OF THE 



I i I 



American Philosophical Society 



^•X^^ HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LIX. 1920. No. 3. 



CONTENTS 



PAGE 



The Components and Colloidal Behavior of Plant Protoplasm. By D. T. 



MacDougal and H. a. Spoehr - - - - 150 



The Phosphorescence of Renilla. By G. H. Parker - - 171 



The Einstein Theory. By E. P. Adams - - - - 176 



Slav and Celt. By J. Dyneley Prince - - - - 184 



Products of Detonation of TNT. By Charles E. Munroe and Spen- 

 cer P. Howell - - - - - - 194 



The Reefs of Tutuila, Samoa, in their Relation to Coral Reef Theories. 



By Alfred GoLDSBORouGH Mayor . . _ - 224 



tjolgotha. By Paul Haupt. - - - - - 237 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 

 104 South Fifth Street 

 1920 , 



