SCIES0B—ADVBBTISEMENT8 



Walker Prizes in Natural History 



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

 oSered 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, bat 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 In all cases the memoirs are to be based on a considerable body of original and unpublished 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 memoir which shall furnish proof of the identity of the author shall be con- 

 sidered 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 enclosing 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 April 1st of the year for which the prize is offered. 



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

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



Subjects for 1913 and 1914:— 



Any biological or geological subject. 



GLOVER M. ALLEN, 

 Boston Society of Natural History, Secretary. 



Boston, il/fflss., U. S. A. 



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