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CONTENTS 



Original Papers 



Page 

 Chemistry. — ^A note on the precipitation of zirconium phosphate. George 



Steiger 637 



Botany. — The North American species of Genipa. Paul C. Standley 639 



Zoology. — Classification of the Philippine operculate land shells of the family 

 Helicinidae, with a synopsis of the species and subspecies of the genus 

 Geophorus. Paul Bartsch 643 



Abstracts 



Crystallography 658 



Mammalogy 659 



Phytopathology 660 



Plant Physiology 661 



Agronomy ._^ 661 



Technology 662 



Proceedings 



Washington Academy of Sciences 663 



Entomological Society of Washington ' 663 



