428 General Notes. [April. 
Professor Carnoy has undertaken an extremely difficult task, 
and the success with which he has accomplished the first part is 
a sufficient guaranty of an equally successful conclusion. The 
best that we can wish for it is, that it may meet with a reception 
as favorable as it deserves. 
PERGENS’S PicrocaRMINE—I. 1. Boil for two and a half hours 
500 grms. pulverized cochineal in thirty liters of water. 
2. Add fifty grms. potassic nitrate, and, after a moment of boil- 
ing, sixty grms. oxalate of potash; boil fifteen minutes. 
3. After cooling, the carmine settles: it is washed several times 
with distilled water in the course of three or four weeks. 
I. 4. Pour a mixture of one volume of ammonia with four 
volumes of water upon the carmine, taking care that the carmine 
remain in excess. ; 
5. After two days filter, and leave the filtered solution exposed 
to the air until a precipitate forms. 
ilter again, and add a concentrated solution of picric acid ; 
agitate, and then allow it to stand twenty-four hours. 
7. Filter, and add one gram chloral for one litre of the liquid. 
8. At the end of eight days, separate the liquid from the slight 
precipitate which is formed, and it is ready for use. 
This fluid keeps unchanged for at least two years, and is recom- 
mended by Carnoy above other picrocarmine solutions. 
PROCEEDINGS OF THE AMERICAN SOCIETY oF Microscopists2— 
The seventh volume of the Proceedings of the American Society 
of Microscopists contains, besides President Cox’s address on 
Robert B. Tolles, about forty articles, some of which contain 
valuable information for the microscopist. We may call especial 
attention to the articles on Photomicrography by the President 
and H. F. Atwood; the observations of the editor in chief, Dr. D. 
S. Kellicott, on Infusoria, Rotatoria, &c.; thoughts on Sponges 
y Henry Mills; a new mounting medium by H. L. Smith; 
serial sections by S. H. Gage; hints on hardening, imbedding, 
cutting, &c., by Geo. Duffield; a cover-glass cleaner by T. L. 
James ; the ideal slide by F. M. Hamlin; the magnifying power 
of objectives and lenses by W. H. Bulloch ; a method of staining 
and mounting by J. T. Brownell; a lens holder by R. H. Ward; 
an improvement in objectives by Ernst Gundlach. The volume 
contains other articles of more or less interest, report of commit- 
tee on standard micrometer, and on oculars. 
OURNAL OF THE New York Microscopicat Socrery.—The 
first number of this new microscopical journal contains an inter- 
esting article on Electrical Illumination in Microscopy, by E. 
A. Schultze; and another entitled Criticisms on Mr. J. Krutt- 
1 Biologie Cellulaire, by J. B. Carnoy, p. 92, 1884. 
2 Seventh Annual Meeting, held at Rochester, N. Y., Aug. 19-22, 1884. 
