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"Should be on the reference shelf of every col- 

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 United States." — Journal of Geography, Vol. XIII, 

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RECENT TITLES 



Ceremonies of the Porno Indians, by S. A. Barrett 45 



Porno Bear Doctors, by S. A. Barrett .25 



The Position of Yana in the Yokan Stock, by Edward 



Sapir 35 



Aphididae of California. New Species of Aphididae and 

 Notes from Various Parts of the State, but chiefly 

 from the Campus of the University of California, 

 by B. O. Essig 45 



Aecidians of the Littoral Zone of Southern California, 



by W. E. Hitter and "Ruth A. Forsylh 1.00 



A Distribut'onal T.ipt of the Amohibians and Rpptil^^s of 



California, by Joseph GrinneU and Charles L. Camp .85 



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Mechanics, Molecular 

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By Robert A. Millikan, University 

 of Chicago. S1.50. 



Electricity, Sound and Light 



By RoBEKT A. Millikan, University 

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A remarkably successful one-year course 

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Each chapter deals with some important 

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 and problems. 



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The Ellen Richards Research Prize 



The Naples Tabla Association for Promoting 

 Laboratory Research by Women announces the offer 

 of a research prize of S 1000. 00 for the best thesis 

 written h? an Araerioan woman embodying new ob- 

 lervHtimis anil new oonolusions based on independent 

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 tained from the secretary, Mr». Ada Wing Mead, 

 S23 Wayland Avenue, Providence, R. I. 



