162 BACTERIA. 



The Ziehl-Nielsen method and Sulphuric Acid is also very 

 similar to the above Magenta, but I think the Magenta is to be 

 preferred. All the other methods can be found in the various 

 journals and tried by those who wish to experiment ; but the two 

 stains given are all that are required by the student and busy 

 practitioner. 



Bibliography. — Cohn, Beitrage zur Biologic der Pflanzen ; 



Q. J. Micros. Science, 1873; 



Klein, Rep. Medical Officer to the Local Government Board ; 



,, Micro-Organisms, 3rd ed. ; 

 Magnin and Sternberg, Bacteria, 1884; 

 Friedlander, Micros. Technik. ; 

 Cornil et Babes, Les Bacteries ; 

 Gibbes, Practical Histology and Pathology, 1885 ; 

 Woodhead and Hare, Practical Mycology, 1885 ; 

 DoUey, Technology of Bacteria Investigation, 1885 ; 

 Hueppe, translated by Biggs, The Methods of Bacteria Inves- 

 tigation, 1886 ; 

 De Bary, Verg. Morp. und Biolog. der Pilze, etc. ; 

 Dallinger and Drysdale in Journ. Royal Micros. Soc. ; 

 Grove, Synopsis of Bacteria, etc. ; 

 Miller, Deut. Med. Woch. ; 

 Crookshank, Manual of Bacteriology ; 

 Green, Hamilton, Payne, and Ziegler, Pathology ; 

 Am. Monthly Micros. Journ., July, 1889 ; 

 Journ. Roy. Micros. Soc, etc. 



The New Apochromatic Lens. — In our last issue it was stated 

 that the price of this lens was ^40. Dr. Pelletan had described 

 it as costing 10,000 francs, but it was announced at a recent 

 meeting of the Royal Microscopical Society that Dr. Pelletan had 

 intended to write 1,000 francs. 



