Walker Prizes in Natural History 



By the provisions of the will of the late Dr. William Johnson Walker two prizes are annually 

 oflfered by the Boston Society of Natural History for the best memoirs written in the English 

 language, on subjects proposed by a Committee appointed by the Council. 



For the best memoir presented a prize of sixty dollars may be awarded; if, however, the memoir be 

 one of marked merit, the amount may be increased to one hundred dollars, at the discretion of the 

 Committee. 



For the next best memoir a prize not exceeding fifty dollars may be awarded. 



Prizes will not be awarded unless the memoirs presented are of adequate merit. 



The competition for these prizes is not restricted, hut is open to all. 



Attention is especially called to the following points : 



1 . In all cases the memoirs are to be based on a considerable body of original and unpublished work, 

 accompanied by a general review of the literature of the subject. 



2. Anything in the memoirs which shall furnish proof of the identity of the author shall be considered 

 as debarring the essay from competition. 



3. Although the awards will be based on their intrinsic merits, preference may be given to memoirs 

 bearing evidence of having been prepared with special reference to competition for these prizes. 



4. Each memoir must be accompanied by a sealed envelope inclosing the author's name and superscribed 

 with a motto corresponding to one borne by the manuscript, and must be in the hands of the Secretary on or 

 before March i of the year for which the prize is offered. 



J^P" Note the change of datei or receipt of manuscripts — now March i. 



5. The Society assumes no responsibility for publication of manuscripts submitted, and publication 

 should not be made before the Annual Meeting of the Society in May. I 



SUBJECT FOR 1916 AND 1917: 



Any subject in the field of Natural History 



GLOVER M. ALLEN 

 Boston Society of Natural History Secretary 



Boston, Mass., U.S.A. 



Principles of Stratigraphy 



By AMADEUS W. GRABAU, S.M., S.D. 



Professor of Palaeontology in Columbia University 



Large octavo, 1150 pages, with 264 illustrations in the text 

 Cloth bound - Price $7.50 



Send for descriptive circular and sample pages 



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A. G. SEILER & CO. 



1224 Amsterdam Avenue - NEW YORK, N.Y. 



