1 6 BACTERIOLOGY. 



Water, distilled. 



Water, sterilised. 



Distilled water can be kept for use in a wash 

 bottle, or far better in a siphon apparatus. Steri- 

 lised water is convenient in plugged sterile test-tubes 

 which may be kept close at hand in a beaker, 

 or tumbler, with a pad of cotton wool at the 

 bottom. The numbered reagents can be conveni- 

 ently arranged on shelves within easy reach. 

 Alcoholic solutions of the aniline dyes and other 

 special preparations should be kept in bottles 

 with ground glass stoppers. Aqueous solutions of 

 the dyes may be kept in bottles with funnel filters, 

 and the solution filtered before use. To both 

 aqueous and alcoholic solutions a few drops of 

 phenol, or a crystal of thymol, should be added as 

 a preservative. For the rapid staining of cover- 

 glass preparations, it is convenient also to have the 

 most frequently used stains (fuchsine, methyl-violet) 

 in bottles provided with pipette-stoppers. 



(D) REAGENTS FOR MOUNTING AND PRESERVING 

 PREPARATIONS. 



Acetate of potash. 



Concentrated solution. 



Asphalte lac. 



