cciv NATURE [JUNE 30, 1923 
IMPORTANT BOOKS 
Please send for detailed Prospectuses N. 1 

HIGH FREQUENCY PRACTICE. 
For Practitioners and Students. By 
By B. B. GROVER, M.D. 
Electricity as an agent in the treatment of diseased or 
perverted conditions of the human organism is becoming 
daily of more importance. The methods of treatment 
given in this volume are mainly founded on the personal 
experience of the writer, but reference has been made to 
all available literature on the subject. 
2nd edition revised. 411 pages, 92 figures. 
Price 21s, net. 
LABORATORY MANUAL IN GEN- 
ERAL MICROBIOLOGY. By Warp 
GILTNER, 
Gives a working knowledge of laboratory methods used 
in the study of micro-organisms, together with a series 
of exercises demonstrating their various physiological 
activities. 
418 pages. 72 figures. Price 17s. Gd. net. 
FOOD INSPECTION & ANALYSIS. 
By ALBERT E, LEACH and A. L. WINTON. 
The work has been thoroughly revised and enlarged. 
Much new matter on the constituents of food, numerous 
analyses, and recent analytical methods have been 
incorporated. 
togo pages. 160 figures. Price 42s. 6d. net. 


BACTERIOLOGY AND MYCOLOGY 
OF FOODS. By FREb W. TANNER, Ph.D. 
A course in food microbiology for those wishing to fit 
themselves for food control work, for food chemists, and 
for students in household science possessing sufficient 
fundamental training in chemistry. Methods of analysis 
are presented, and their history and ‘‘make-up” are 
discussed. 
592 pages. 97 figures. Price 30s. net. 
GERMAN-ENGLISH DICTION- 
ARY FOR CHEMISTS. By Austin 
M. PATTERSON, Ph.D. 
Contains over 30,000 definitions. It includes terms 
from all branches of Chemistry and the various chemical 
industries, and such terms from allied sciences as are 
likely to appear in chemical literature. 
332 pages. Flexible binding. Price 12s. 6d, net. 
A FRENCH-ENGLISH DICTIONARY 
FOR CHEMISTS. By Austin M. 
PATTERSON, Ph.D. 
On the same lines as the above. Defines over 30,000 
words and phrases and contains many irregular verb 
forms, and all common general words likely to appear in 
scientific literature, together with a valuable article on 
the conjugation of French verbs. 
403 pages. Flexible binding. Price 15S. net. 

CHAPMAN & HALL, LTD., 11 HENRIETTA ST., STRAND, LONDON, W.C.2) 


ak esas MICROSCOPES 
This Microscope is of 
the highest grade, 
designed to meet the 
requirements of re- 
search workers and 
expert microscopists. 
It embodies every 
adjustment which ex- 
perience has shown to 
have practical utility, 
The large Body Tube 
is a valuable asset 
for photography. 
The Stage is 150 mm. 
in diameter, it re- 
volves,can becentred, 
is graduated to de- 
grees, vernier reads 
to three minutes. 
The Mechanical 
Stage is built into the 
stage, it can easily be 
removed and a metal 
slide be _ inserted, 
giving an even plain 
stage at no extra ex- 
: pense. The Substage 
Spencer Research Microscope embodies all adjust- 
No. 5H ments. 

Fullest information of this and other Models on request. 
STANDLEY BELCHER & MASON, LTD., 
Church Street, Birmingham. 


LABORATORY GLASSWARE 
BEAKERS, FLASKS, 
RETORTS, etc. 
Porcelain 
CRUCIBLES AND BASINS 
Filter Papers 
Pure Chemicals 
JOHN J. GRIFFIN & SONS, 
LIMITED, 
KEMBLE STREET, KINGSWAY, 
LONDON, W.C.2. 


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