CONTENTS 



Original Papers 



Page 



Mathematics. — Note on an integrating device. M. D. Hersey 617 



Phjsics. — Note on a relation connecting the derivatives of physical quan- 

 tities. M. D. Hersey 620 



Botany. — Ammocodon, a new genus of Allioniaceae, from the southwestern 

 United States. Paul C. Standley 629 



Abstracts 

 Technology 632 



Proceedings 



The Philosophical Society 633 



The Botanical Society 636 



