FOI/S GLYCERIN JELLIES. 247 



the apparatus the funnel is filled with glycerin gelatin, and 

 the bottle with hot water, which runs off slowly through the 

 tube in the first hole and is constantly replenished. 



Some drops of carbolic acid should be added to the fluid 

 product of the filtering. For mounting, use warm by melt- 

 ing a small portion on the slide, the object having been pre- 

 viously soaked for some time in a small bottle of the medium 

 warmed with a suitable apparatus. 



410. Kaiser's Glycerin Jelly (Bot. Cent., 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 filter. Use for mounting as above. 



I prepared some of this jelly many years ago, and find it is 

 still perfectly clear. 



411. Seaman's Glycerin Jelly (Amer. Mon. Mic. Journ., ii, 

 1881, p. 45; Journ. Roy. Mic. Soc. [N.S.], i, 1881, p. 534).- 

 Dissolve isinglass in water, so that it makes a stiff jelly when 

 at the ordinary temperature of the room, add one tenth as 

 much glycerin, and a little solution of borax, carbolic acid, 

 or camphor water. Filter whilst warm through muslin, and 

 add a little alcohol. 



412. Fol's Glycerin Jellies (Lehrb., p. 138). 



1. Melt together one volume of Beale's jelly ( 408) 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 parts. 



Water 150 



Glycerin 100 



Alcoholic solution of camphor . . 15 



