The Microscope. 157 



Peof. W. D. Halliburton I'ecommends {Quarterly Journal of 

 Microscopical Science) the following as an easy way to get Methse- 

 moglobin crystals: Detibrinate a few cubic ceiitimeters of the blood 

 of a rat, guinea-pig or squirrel, and add to it a few drops of amyl 

 nitrite, and shake violently for a minute or two, or until the nitrite 

 assumes a chocolate color. A drop of this is withdrawn with a 

 pipette and placed on a slide, the cover-glass being applied immedi- 

 ately. In a few moments the methfemogloblin crystals will begin to 

 form. By sealing the edge of the cover-glass, the crystals will 

 remain unchanged a very long time. — National Druggist. 



BOOK REVIEWS, 



The Art of Projecting. A Manual of Experimentation in Physics, Chem- 

 istrv and Natural History with the Porte Lumiere and Magic Lantern. 

 By "Prof. A. E. Dolbear, M. E., Ph. D. Lee & Shepard, Boston, 1888. 

 Pp. 178. 



The second edition of Prof. Dolbear' s well-known work will be 

 welcomed by all microscopists who are interested in the management 

 and construction of the magic lantern. Light, lenses and projec- 

 tions are discussed in a popular but scientific manner in the 

 first part of the work; the second and larger portion being given 

 up to the demonstration of physical experiments. The book is well 

 illustrated by silhouettes and wood cuts. It will be found to be a 

 valuable addition to the working microscopist's library. 



Walmsley's Illustrated Catalogue op Photographic Cameras, Lenses 

 Etc 



We have just received part four of the eighth edition of this 

 well-known catalogue, in which there have been some changes of 

 prices and numbers. A full line of photographic instruments, mate- 

 rials &c., are here described, but the cameras which may be used in 

 photo-micrography are of particular interest to the microscopist. 

 We have elsewhere expressed our opinion that the Walmsley's 

 improved photo-micrographic camera, with a Beck or Darlot lense, 

 is the most useful camera for the physician's general use that we 

 have seen. 



The International Scientists' Directory. S. E. Cassiuo, Boston, 1888. 



The great labor necessary to the successful compiling of such 

 a directory as this will be fully appreciated by those who have ever 

 undertaken the collecting of even a limited number of names, — and 

 that there are occasional omissions will not be wondered at. Mr. 

 Cassino has rendered a service to all lovers of science in this new 



