220 THE NORTHERN MICROSCOPIST. 

which will contain similar lists of the works relating to the micros- 
cope proper, the Protozoa, the Desmidiz, and to some other 
branches of Natural Science. These are nearly completed, and 
will follow promptly. 
This catalogue is intended for private distribution, and the 
number of copies is necessarily very limited. I have, however, 
reserved fifty copies for gratuitous presentation to such Micros- 
copical Societies as may make early application through their 
respective Secretaries.” Mr. Julien Deby’s address is 75, Holland 
Road, Kensington, London, W.—Eb. 
Lhe Journal of the Postal Microscopical Society, No. 2. London: 
W- Pe Collms, 
This periodical in its second issue is fully as interesting as the 
first number. There is much that is valuable in it, and very read- 
able is “An Hour at the Microscope” by Mr. Tuffen.West. We 
must however take exception to the instructions given for photo- 
micrography, except it be the sentence “ the best and quickest way 
** would be to go to a photographer and take a few lessons” 
which we fully endorse so far as regards developing plates. 
Our advice is always, “do not purchase lenses specially corrected 
for photography—ordinary lenses will do quite as well.” We do 
not agree, either, in instructing the amateur to use magnesium light 
for such low powers as the one inch and half inch, an ordinary 
argand gas lamp will do all that is required. Only yesterday we 
obtained a very good picture of Polycistina x 65 diameters with 
the inch objective and A eyepiece, the slide being illuminated with 
Wenham’s paraboloid. An exposure of two minutes was required, 
while when the C eyepiece was substituted for the A, giving there- 
by 130 diameters, four minutes was found necessary. What more 
could the amateur require ? 
It is well to put on record here, that some lenses require to be 
approached the slide in order to correct for actinic focus. There 
is much in the article, however, that is interesting, and the sentence, 
“the majority of amateurs expose dry plates too long,” should be 
always borne in mind. 
Studies in Microscopical Science. Edited by A. C. Coz, F.R.M.S. 
London: Ballitre, Tindall, & Cox. 

Numbers 7, 8, 9, and 10 of this weekly periodical are now be- 
fore us, and the microscopist must be hypercritical indeed if he be 
not pleased with the result of Mr. Cole’s work. No. 7 is devoted 
to a description of the Spinal Cord of Cat: the etymology is well 


