NOTES AND QUERIES. 193 


of about a quarter of an inch, and pour in more plaster cream 
until the cyanide is about half an-inch below the surface. When 
dry, cork the bottle tightly, as it will be ready for use.—A. #. D. 
STUDIES IN MICROSCOPICAL SCIENCE.—Four more numbers of 
this important Journal are now in subscribers’ hands, and the 
character of the publication is well sustained. No. 4 contains a 
chromo-lithograph of a transverse section of the closed fibro-vas- 
cular bundles of Cyperus alterntfolius, the umbrella plant, the text 
giving a full description of the methods of preparation and a good 
Bibliographical list. No. 5 illustrates the beautiful section of 
Human Skin accompanying it, while Nos. 6 and 6a are devoted to 
a description of Pikrite from Inchcolm on the Firth of Forth ; the 
former shows its appearance under polarized light, while the latter 
contains a plate serving as an analytical chart to the former. The 
four numbers are exceedingly interesting. Great praise is due to 
the Editor and his assistants; and we must add a few words of 
praise also on behalf of the chromo-lithographs, which Messrs. 
Watson and Son, of Birmingham, have sent forth from their 
establishment. 
MIcRoscoPicaL LITERATURE.—Mr. W. P. Collins has just issued 
his June catalogue of new and second-hand books upon Alge, 
Bacteria, Desmids, Diatoms, Foraminifera, Infusoria, Histology, 
Petrology, Botany, Biology, Natural History, Physiology, &c., &c. 
It furnishes a complete list of works for the Microscopist. 
PHOTOMICROGRAPHY.—We have received a small treatise, Précts 
de Microphotographie, from the author, M. G. Huberson. In the 
compass of roo pages he tells us how photomicrography is practised 
abroad, and the English operator may find a few hints to aid him 
in his work, though we fear he will not adopt the apparatus figured 
in the treatise. ‘The book is illustrated by a plate (photo-engraved) 
of Finnularia nobilis, and there is an appendix, giving a few very 
useful receipts, comprising the silvering of mirrors and the solutions 
used therein. On the whole, the work may be perused with profit, 
but it must not be forgotten that considerable advances have been 
made of late in this country and in America. 
THE RELATION OF APERTURE AND POWER IN THE MICROSCOPE, 
—A paper from the pen of Prof. Abbe appears in the June number 
of the Journal of the Royal Microscopical Society upon this subject. 
We mention this in order that those of our readers who wish to 
read it zn extenso may do so; but we purpose giving an abstract of 
this paper in our next number. 
DousLr Staininc.—The coloring matters generally recom- 
mended for the double staining of vegetable tissues have already 
been mentioned in this Journal. Mr. J. M. Macfarlane states that 
saffranine and emeraldine are preferable, as the former 1s a more 
