' 24 1916 



PROCEEDINGS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 

 Vol. LV. 1916. No. 5. 



CONTENTS 



PAGE 



Age Cycles and Other Periodicities in Organisms. By C. M. Child . 330 

 Types of Neuromuscular Mechanism in Sea-Anemones. By G. H. 



Parker 340 



Inheritance through Spores. By John M. Coulter 344 



The Popes and the Crusades. By Dana C. Munro 348 



A Rare Old Slavonic Religious Manual. By J. Dyneley Prince . . 357 

 Jointing as a Fundamental Factor in the Degradation of the Litho- 



sphere. By Frederick Ehrenfeld • , 363 



Sight and Signalling in the Navy. By Alexander Duane .... 400 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 



1916 



