Walker Prizes in Natural History 
Y the provisions of the will of the late Dr. William Johnson Walker two 
prizes are annually offered by the Bo>Ton 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 ts not restricted, but ts 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original and unpublished work, accompanied by a general review of the litera- 
ture of the subject. 
2. Anything in the memoir which shall furnish proof of the identity of 
the author shall be considered as debarring the essay from competition. 
3. Preference will be given to memoirs showing intrinsic evidence of 
being based upon researches made directly in competition for the prize. - 
a 4. Each memoir must be accompanied by a sealed envelope enclosing 
e " “ author’s name and superscribed with a motto corresponding to one borne 4 
_ by the Manuscript, and must be in the hands of the Secretary ¢ on or before 
hae tst of the year for which the prize is offered. : 
si 
Nuclear fusions in plants. S ae 
The ag of specific areas of the germ of Chordates, as determined by 
. a, dias: 
es ie tes reactions of organisms to solutions, considered from the s stand 
point of the chemical theory of dissociation, 
ee : 
_ FOR 1903: 
i A monograph of any genus or group of Thallophytes 
. Sorattistions to the life erreed of Sporozoa. | a 
on | GLOVER 
ATURAL History, _ 
