REVIEWS. 125 



Manuel du Touriste Photographe, par M. Leon Vidal, 



Premier Partie. Couches sensibles Negatives ; Objectifs ; Appareils portratifs ; 

 Obturateurs rapides ; Pose et Photometrie ; Developpement et Finage ; Rex- 

 for^ateurs et Reducteurs ; Vernissage et Retouche des Xegatifs ; pp. XIV. — 

 348. (Paris : Gauthier-Villars, Imprimeur-Libraire. 1885.) 



The work before us will doubtless prove of much service to the photogra- 

 phic tourist. We have submitted it to one of our most successful landscape 

 photographers. He assures us of its great practical value ; he tells us that the 

 remarks found on pp. 9 to 13 inclusive, which relate to the preparation of the 

 emulsion, are especially worthy of notice. The book is illustrated with a pho- 

 totype frontispiece and 60 engravings. 



The Year-Book of Photography and Photographic News 



Almanack for 1885. Edited by Thomas Bolas, F.C.S. ; pp. 216. — Contains in 

 a condensed form a summary of the photographic work of the past year, and 

 deserves a place in the laboratory of every photographer. 



The Magic Lantern and its Management, inckiding full 



practical Directions for Producing the Lime-Light, making Oxygen Gas, and 

 Preparing Lantern Slides. By J. C. Hepworth ; pp. VIII. — 75. (London : 

 Chatto and Windus. 1885.) 



In addition to all that is set forth in the title, we have an account of the 

 Lantern Microscope and many other matters, which every amateur exhibitor 

 eagerly desires to know. The instructions throughout are plain, and will be 

 found valuable. There are nine illustrations. 



Natural Law in the Spiritual World. By Henry Drum- 

 mond, F.R.S.E., F.G.S., etc. Fourteenth edition; pp. 414. (London: 

 Hodder and Stoughton. 1884.) 



The object of the author of this interesting book is to prove the harmony of 

 religion and science, and to show that the system of law which is established 

 in the natural world holds equally true in the spiritual world. We have read 

 this book with much pleasure. 



Evenings at the Microscope; or, Researches among the 

 Minuter Organs and Forms of Animal Life. By Philip Henry Gosse, P\R.S. 

 Anew edition, revised and annotated; pp. X. — 422. (London: Society for 

 Promoting Christian Knowledge. 1884.) 



It is a pleasure to call attention to a new edition of this very popular book, 

 every word of which the author assures us has passed under his eye, and has 

 been examined with earnest care, and that many new facts have been added to 

 enrich the work. 



The Formation of Poisons by Micro-Organisms : A Biolo- 

 gical Study of the Germ Theory of Disease. By G. V. Black, M.D., D.D.S. ; 

 pp. 117. (Philadelphia, U.S.A. : P. Blakiston and Co. 1884.) 



In the volume before us, the author traces the history of the Germ-Theory 

 of Disease from the days of Homer to the present time ; he also suggests theo- 

 retically the manner in which the germs act in producing disease. 



