Walker Prizes in Natural History. 
The Boston Society of Natural History, 
oe offers a first. prize of from $60 to $100 anda second 
‘ prize of a sum not exceeding $50, for the best memoirs, 
in English, on the following subject : 
history of Any Plant or Animal. 
Each memoir must be accompanied by a scale 
script, and must be handed to the Secretary, on or 
before April Ist, 1893. 
Prizes will not be awarded unless the memoirs 
are deemed of adequate merit. 
For further particulars apply to 
Die SAMUEL HENSHAW, 
oston, July, 26, 1892. 
pi 
Contributions to Our Knowiedge of the Lifes: _ 
envelope enclosing the author's name and apenail i 
by a motto corresponding to one borne by the manu- 
