SCIENCE-ADVERTISEMENTS 



XI 



Journal of the Washington 

 Academy of Sciences 



Now in its Third Year of publication 



Editors : 



F. L. Ransome C. S. Scofield F. E. Wright 



Appears semi-monthly with about BOO pages a year. 

 Alms to give a prompt and complete record of the 

 BCientiSc work in WashingtoB, in the form of original 

 papers, authors' abstracts, and the Proceedings of the 

 fifteen Washington scientific societies. Subscription, 

 $6.00 a year, postpaid. Sample copies sent on request. 

 Address, Treasurer, Washington Academy of Sciences, 

 Washington, U. S A. 



European Agents: 

 William Wesley & Son, 28 Essex St., Strand, London, and 

 Mayer & Muller, Prince Louis Ferdinand 8tr., Berlin. 



Shells! Shells! 



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J C* ROWELL 

 3415 West Street Oakland, CaUfornia 



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MARINE BIOLOQICAL LABORATORY 



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QEORQE M. GRAY, Curator, Woods Hole, Mass. 



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