viit ADVERTISEMENTS. 
Walker Prizes in Natural History. 
By the provisions of the will of the late Dr. William Johnson Walker 
two prizes are annually offered by the Bosron Socrgry or 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 
ene 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, but open to all. 
E&ch memoir must be accompanied by a sealed envelope hidini 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 ist of a 
the year for which the prize is offered. 3 
SUBJECTS FOR 1895 :— 
(1) A study of the “ Fall line” in New Jersey. 
(2) A study of the Devonian formation of the Ohio basin. 
(3) Relations of the order Plantaginaceae. 
(4) Experimental investigations in morphology or embryology. 
SUBJECTS FOR 1896 :— 
(1) A study of the area of schistose or foliated rocks in theeastern United 
8. 
(2) A study of the developement of river valleys in some considerable 
area or folded or faulted Appalachian strueture in Pennsylvania, Virginia, of 
Tennesee. 
(3) An experimental study of the effects of close-fertilization in the case - 
of some plant of short cycle. 3 
(4) Contributions to our knowledge of the general morphology or the : 
general physiology of any animal except man. à 
NoTE—In all cases the memoirs are to be based on a considerable body of original work, 
ás well.as on a general review of the literature of the subject. 
SAMUEL HENSHAW. 
Secretary. 
Boston Society of Natural History, 
Boston, Mass, U. 8. A. 
