ViLLJAM A. SETCHEU 





VOLUME 17 

 :N^ U M B E R 7 

 JULY 1914 



CONTAINING 



On the Influence of the Order of Development of the Fruits of Passi- 

 flora Gracilis upon the Frequency of Teratological Variations 

 By J. Arthur Harris and Ross Aiken Gortner 199 



Notes on the Ecology of Sand Dvine Plants 



By Edward B. Couch 204 



On the Density of the Cell Sap in Some Desert Plants 



By W. A. Cannon 209 



A Summer's Record of Evaporation and Precipitation in Lancaster 

 County, Pennsylvania 

 By Carolina Rumbold 213 



Books and Current Literature 216 



Notes and Comment 221 



PUBLISHED MONLHLY 



OFFICE OF PUBLICATION 



2419-21 Greenmount Ave. 

 baltimore, md. 



EDITORIAL OFFICE 



TUCSON, ARIZONA 



Entered as second-class matter March 9, li)12, at the post o.'iice at Baltiraor, Maryland, under the Act of July 10, 1894 



