Walker Prizes in Natural History. 
By the provisions = the will mi the late Dr. William Johnson Walker two prizes are annually offer 
by the Bo OSTON SOCIETY OF NATURAL HISTORY for the memoirs written in the English actor on 
ee he aap by a committee appointe ® 
Fo est memoir presented a prize of bee _— may be awarded; if, however, the memoir be 
one of eee: merit, the amount may be increased to one hundred dollars, at the discretion of the Com- 
: se pr S 
map is especially called to the following points: 
l cases t i dona Caer body of original and unpublished work, 
Bo 
“a 
) 
Lex | 
oO 
i) 
“> 
3) 
o 
peseiiiccenes by a general review of the literature of the sub 
2. Anything in the memoir which shall furnish sal of ee identity of the author shall be considered 
as pige the essay from competition. 
3: i i memoirs showing intrinsic evidence of being based upon researches 
made givecty in sta oie for the prize 
Each memoir must cc companied by a sealed — enclosing the author’s name and super- 
one borne by the a and must be in the hands of 
8. A research in mineral physics. , 
A ibution to geological lation in the United 
work, change of sea level, mountain building, etc,). 
scrib d wit tto encete ndin 
th Secretary on or before April rst of the year for which the prize is offered 
e Society assumes no responsibility for peblicatien of sathvee i submitted. 
ngs rola fas 1904: Subjects for 1905: 
The reactions of org s to solutions, consider 1. The life orp of ney parasitic fungus. 
from the standpoin t of the chemical theory of dissociation. Pe 2. iy ntributio wledge of the physiology of 
. Relation of pl pia 
statistical’ st y ot the ealative bab tenlies be 3. ‘Contribution to the development of some group of 
tween the varietie ” | fossil organisms. 
sofa ‘ 
h , 4. Study of hybridsin animals o r pla nts. 
4 chemical and pet reactions in cell narcosis. 5: cxieied uly of geographica as 
: Causes of volcanic eruptio aroun research in experimental re ig 
. The effects of p resent physical ch of A held stu eling (pene- 
cama s surface on the ] f (e. Paes river | vlaalen’. 
| 
Boston Society of Natural History, Boston, Mass., U.S.A. GLOVER M. ALLEN, Secrefary. 
Methods in Plant Histology 
By CHARLES J. CHAMBERLAIN, A.M., PH_D., Instructor in Botany in the University of Chicago 
A CONSTANT HELP to Teachers and Students of Botany 
CONTAINS DIRECTIONS FOR COLLECTING AND PREPARING 
PLANT MATERIAL FOR MICROSCOPIC INVESTIGATION 
T is based upon a course in botanical micro-technique, and is the first complete manual t 
be ‘published on this subject. It is the result of several years’ work with classes in n residence 
at University of Chicago, and with University Extension es away fro e Un 
versity. It , ther e, to meet t quire ts, not o ly of the student who gir 
ance of an instructor in a fully equipped laboratory, but also the st ho must work by himself 
and with limited appa Free-hand maa ning, the paraffin method, the collodio method, 
and the glycerine method, are treated in siderable detail. In later chapters specific direc- 
n by se who — to study the 
ions are given for making such prepar balan ns as are need 
plant kingdom from the algze up to the flowering plants. Specia al attention i 
ia of a pena figures, because the student who masters this problem will find little ag 
ating other structures. Formulas are given for the reagents commonly used in 
ory. 
n differenti 
iiteleeiad laborat 
oO Pp., 8vo, illustrated, cloth, (vet) $1.50; postpaid $1.59 
For sale by dealers or by the publishers 
The University of Chicago Press, Chicago, Illinois 
