APPARATUS, MATERIAL, AND REAGENTS. IJ 



Canada balsam. 



Dissolved in xylol. 



Glycerine gum (Farrant's solution). 



Glycerine. 

 Water. 



Saturated solution of arsenious acid. 

 Equal parts, mix and add solution of gum 

 arabic half a part. 



Hollis' glue. 

 Zinc-white.* 



(E) DRAWING AND PHOTOGRAPHIC APPARATUS. 



Camera Lucida. The camera lucida of Zeiss 

 is an excellent instrument, though many prefer the 

 pattern made by Nachet of Paris. Combined with 

 the use of a micro-millimeter objective it affords 

 also a simple method for the measurement of 

 bacteria. 



* All instruments and material, microscopes, microtomes, aniline 

 dyes, celloidin, gelatine, etc., etc., for bacteriological work can 

 be obtained in Germany through G. Konig, Berlin, N.W., 35, 

 Dorotheen Strasse. Chemicals, staining reagents, and ready-pre- 

 pared nutrient gelatine can also be obtained from Dr. Georg 

 Grubler, Leipsig, 17, Dufour Strasse. Solutions of lithium-carmine 

 and picro-lithium-carmine (Orth), picro-carmine (Weigert), alum 

 and borax carmine (Grenacher), etc., ready for use, can be 

 obtained from the latter. 



