44 BACTERIOLOGY. 



may be dried in this way, and preserved for 

 subsequent experiments. 



Other items commonly in use in a research 

 laboratory cannot be detailed here, and a descrip- 

 tion of air-pumps, refrigerators, etc., access to 

 which is nevertheless necessary for some special 

 investigations, must be sought for elsewhere.* 



* All bacteriological apparatus, as employed by Professor Koch, 

 may be obtained from Dr. Muencke, 58, Louisen Strasse, Berlin. 

 Nearly all the figures of apparatus here given are from blocks, kindly 

 lent to me by Dr. Muencke. Griffin & Son, 22, Garrick Street, 

 Covent Garden, W.C., will make to order any bacteriological ap- 

 paratus required, and from them all glass vessels and chemical 

 apparatus of home manufacture can be obtained. All histological 

 instruments and material, such as microscopes, microtomes, aniline 

 dyes, celloidin, gelatine, agar-agar, etc., are supplied by G. Konig, 

 Berlin, N.W., 35, Dorotheen Strasse. Chemicals, staining reagents, 

 and ready-prepared nutrient gelatine can also be obtained from Dr. 

 Georg Griibler, Leipsig, 17, Dufour Strasse. Solutions of lithium- 

 carmine, picro-lithium carmine (Orth.), picro-carmine (Weigert), 

 alum and borax-carmine (Grenacher), etc., ready for use, are pre- 

 pared by Becker & Co., 34, Maiden Lane, Covent Garden, London, 

 W.C. The latter firm also keep in stock bacteriological apparatus 

 and glass ware of the German pattern. 



Mr. Baker, of High Holborn, W.C., is recommended for the 

 supply of microscopes and the ordinary objectives by continental 

 makers, and the new apochromatic objectives recently introduced 

 by Zeiss. Objectives made of the new glass are also constructed by 

 Powell and Leland, but though invaluable to the specialist their 

 expense places them beyond the reach of the general student. 

 Messrs. Swift & Son have recently introduced an excellent T \ oil. 

 imm. for five guineas, and are prepared to supply a microscope 

 completely equipped for bacteriological work at a very low price. 



