Reviews. I79 
411.—Lamp-Chimneys.—Has the relation between the lamp 
chimney and the flame ever been made the subject of scientific 
investigation, so as to secure perfect combustion for any sized 
flame by some formula ? W. 
412.—Curling of Paper.—What is the reason why a hair or a 
strip of paper will curl up when drawn swiftly between the nails of 
a finger and thumb ? Et Dt PB: 
413.—Opacity.—The hard parts of insects when bleached in 
chlorine gas become white, but very opaque. How can this 
opacity be got rid of ? Ke Ses. 
414.—Forming Cells.—How can I make holes in glass for the 
purpose of forming cells by cementing the glass with the hole in 
it on to the ordinary slide ? Digicse 
Reviews. 
AN INTRODUCTION TO THE SCIENCE AND PRACTICE OF PHO- 
TOGRAPHY. By Chapman Jones, F.I.C., F.C.S., etc. Crown 8vo, pp. 278. 
(London: Iliffe and Sons. 1888.) Price 2s. 6d. 
In a revised and enlarged form the author gives us a course of lectures 
delivered at the Birkbeck Institution. They treat very fully of the Application 
of Photography and the History of its Development ; The Chemical Action of 
Light, etc. etc. ; of Apparatus; and of the various Processes, to which no 
fewer than 20 chapters are devoted. A useful Appendix is added on Testing 
Lenses, English Weights and Measures, Comparison of the English with the 
Metrical System, and Comparison of Fahrenheit and Centigrade Thermome- 
ters. This forms a valuable acquisition to our library of photographic works. 
THE PHOTOGRAPHER’S NOTE-BOOK AND INDEx, with Tables of 
Exposure and Rules. By David Solomons. (London: Marion and Co.) 
Price Is. 
This is one of the most useful pocket note-books for the photographer 
which we have met with, and we should think that no photographer could 
afford to be without it. 
ANNUAIRE DE L’OBSERVATOIRE MUNICIPAL DE MontTsourIs 
pour l’An. 1888: Meteorologie, Chimie, Micrographie, Applications a 
VPHygiene. (Paris: Gauthiers- Villars.) 
This is the annual statement of meteorological and other work performed 
at the observatory of Montsouris, under the auspices of the Municipality of 
Paris. Full descriptions of the instruments used, together with illustrative 
woodcuts, are given. Besides the usual routine work of an institution of this 
character, the observatory daily analyses the air and water supply of Paris. The 
methods used are given 2” extenso in a paper on the detection of microscopical 
organisms in air and water. 
