554 Analyses of Boohs* [September, 
We would venture to recommend this pamphlet to the careful 
notice of all biologists and physicians. Would not the Society 
for the Promotion of Medicine by Research find a translation of 
Prof. Goltz’s plain, straightforward publication an excellent work 
for distribution ? 
Micro-Photography , including a Description of the Wet Collodion 
and Gelatino -Bromide Processes , together with the Best 
Methods of Mounting and Preparing Microscopic Objects 
for Micro-Photography . By A. Cowley Malley, B.A., 
M.B., B.Ch., T.C.D. London : H. K. Lewis. 
Without Micro-Photography microscopic research is deprived 
of one of its most important auxiliaries. The observer may, 
indeed, preserve his mounted objects to refresh his memory, or 
for exhibition to his friends and colleagues ; but if he wishes to 
lay his results before the scientific world at large, he, but for 
micro-photography, has no other resource save drawings executed 
by hand. Concerning these Dr. Malley very justly remarks : — 
“ I have before me at present some drawings which must have 
taken the artist a week to finish, and even then show the exist- 
ence in his mind of preconceived notions of structure.” 
The second chapter of the little work before us is devoted to 
the properties of lenses, the imperfection of resulting images, 
aberration, &c. Though much of the information here given 
will doubtless be familiar to all persons likely to be working with 
the microscope, the views of Prof. Abbe, of Jena, here quoted, 
may be of advantage to many. 
In the third chapter we have an account of the microscope, 
and of the means of illumination, for which purpose the author 
recommends Swan’s eleCtric lamp. The camera and its accesso- 
ries, the arrangement of the dark room, and the mounting and 
preparation of objects for micro-photographic purposes are next 
described. The photographic processes are next considered. 
The receipts for the solutions required in the collodion process 
are given in metric weights and measures, though in the deve- 
loping solution we meet with the unusual abridgment in alcohol, 
2 £• The formula for the hyposulphite bath is given, however, 
in ounces, the pharmaceutical symbol being somewhat strangely 
employed. On pp. 83 to 88 the formula employed are all ex- 
pressed in pharmaceutical symbols. This is surely an error, 
since all those of Dr. Malley’s readers who are neither medical 
practitioners nor pharmaceutists will fail to understand these 
somewhat cabalistic characters, and before setting to work will 
have to get them interpreted. In our opinion all the formula 
