1884. ] Recent Literature. 273 
the distal end. The number to each segment decreases both 
towards the proximal and distal ends of the cone-bearing region. 
On examination of the only species of which I have living 
specimens just now, C. propinquus, I find the external branch of 
the antennula composed of eighteen or nineteen segments. The 
distal nine of these alone bear olfactory cones, and only five of 
them (the 11th, r2th, 13th, 14th, 15th), have the full number of 
eight on each joint, so that O. pellucidus would appear to form no 
exception to the rule which has been noted above as to the 
European “ Cave” Crustacea.—R. R. W. 
STERNBERG'S PHOTOMICROGRAPHS AND How To MaKe Tuem.— 
Many a naturalist who may be unskilled in drawing, or who may 
desire to reproduce by photography histological preparations, will 
be thankful for this excellent work, which so describes the tech- 
nique of photomicrography as to enable one familiar with the use 
of the microscope to make photomicrographs with the least ex- 
penditure of time and money. The author, who is well known 
for his researches on disease-germs, has designed the work for 
beginners, who, like the author, had resorted to photography for 
the purpose of making pictorial memoranda of his microscopical 
observations. 
The first part of the book is devoted to technology, and con- 
siders light, microscopical apparatus, the camera and photographic 
material, the arrangement of microscope and camera for photo- 
graphy, the operating room and fixtures, etc., the exposure and 
development of the plate, the fixing, intensification and preserva- 
tion of the negative, as well as photographing by reflected light, 
and making positives upon glass. This part concludes with 
chapters upon the selection and preparation of objects for photo- 
graphing 
The second part is devoted to a description of plates, and toa 
Popular account of elementary histology, containing accounts of 
the Ameceda, of Micrococci, of one-celled algz, of epithelial and 
other cells, blood-discs and of vegetable cells and diatoms, the 
microphotographs being excellent. The book is a timely an 
useful one, and though the plates are very useful as examples of 
excellent work, we are not sure that it would not have given 
more unity to the book to have issued the second part as a sepa- 
“oy work. At any rate there will doubtless be a good demand 
„i Suc a hand-book as the present one. It is well printed and 
illustrated, 
Miss Buckey’s Lire anp Her Curtpren2—The title of this 
Photomicrographs ow to make them. Illustrated by forty-seven Photo- 
Sree ticroscopic objects, reproduced by the Heliotype process. By GORGE 
BERG, M.D., U.S.A., etc. Boston, J. R. Osgood & Co., 1883. 8vo, Pp- 
ife and Her Chi n. i i ife f the Amæba to the In- 
188), < ARAMELLA B Beckley Te a hie Vow, D. Appleton & Co., 
mo, Pp. 312, $1.50. 
— NO, rir 
VOL, xvr. 18 
