EXAMINATION AND PRESERVATION MEDIA. 270 



simple arrangement for keeping the funnel warm during the 

 filtering (see previous editions) . 



Some drops of carbolic acid should be added to the fluid 

 product of the filtering. 



431. KAISER'S Glycerin Jelly (Bot. Gent., i, 1880, p. 25 ; 

 Journ. Roy. Mic. Soc., iii, 1880, p. 504). One part by weight 

 finest French gelatin is left for two hours in 6 parts by weight 

 distilled water, 7 parts of glycerin are added, and for every 

 100 grammes of the mixture 1 gramme of concentrated car- 

 bolic acid. Warm for ten to fifteen minutes, stirring all the 

 while, until the whole of the flakes produced by the carbolic 

 acid have disappeared. Filter whilst warm through the finest 

 spun glass laid wet in the funnel. 



I prepared some of this jelly many years ao-o, and find it 

 is still perfectly clear. 



432. FOL'S Glycerin Jellies (Lehrb., p. 138j. 



1. Melt together one volume of Beale's jelly ( 429) and 

 one half to one volume of water, and add 2 to 5 per cent, of 

 salicylic acid solution, or carbolic acid or camphor. 



2. Gelatin . . . . .30 parts. 



Water 70 



Glycerin . . . . . 100 



Alcoholic solution of camphor . 5 ,, 



Prepare as before, adding' the camphor last. 



3. Gelatin . . . . .20 part-. 

 Water . . . . . 150 ,, 

 Glycerin ..... 100 ,, 

 Alcoholic solution of camphor . 15 



433. SQUIRE'S Glycerin Jelly (SQUIRE'S Methods and 

 Formulx, etc., p. 84). Soak 100 grins, of French gelatin in 

 chloroform water, drain when soft, and dissolve with heat in 

 750 grins, of glycerin. Add 400 grins, of chloroform water 

 with which has been incorporated about 50 grins, of fresli 

 egg-albumen ; mix thoroughly, and heat to boiling-point for 

 about five minutes. Make up the total weight to 1550 grms. 

 with chloroform water. Filter in a warm chamber. 



434. GILSON'S Chloral Hydrate Jelly (communicated by Prof. 

 GILSON). 1 vol. of gelatin, melted secundum artem, and 



