278 CHAPTER XX. 



4. JAGER'S LIQUID (YoGT and YUNG'S Traite d'Anat. comp. 

 prat., p. 16). 



Glycerin . . . . .1 part. 



Alcohol . . . . 1 



Sea water . . . . .10 parts. 



Glycerin Jellies. 



427. DEANE'S Glycerin Jelly (from FREY'S Le Microscope, 

 p. 231). 120 grammes glycerine, 60 grammes water, 30 

 grammes gelatin. Dissolve the gelatin in the water, and 

 add the glycerin. This, and the following glycerin jellies, 

 must of course be used warm. 



428. LAWRENCE'S Glycerin Jelly (DAVIES, Preparation and 

 Mounting of Microscopic Objects, p. 84). " He takes a quan- 

 tity of Nelson's gelatin, soaks it for two or three hours in 

 cold water, pours off the superfluous water, and heats the 

 soaked gelatin until melted. To each fluid ounce of the 

 gelatin, whilst it is fluid but cool, he adds a fluid drachm of 

 the white of an egg. He then boils this until the albumen 

 coagulates and the gelatin is quite clear, when it is to be 

 filtered through fine flannel, and to each ounce of the clari- 

 fied solution add 6 drachms of a mixture composed of 1 part 

 of glycerin to 2 parts of camphor water." 



429. BEALE'S Glycerin Jelly (How to Work, etc., p. 57). 

 Gelatin or isinglass, soaked, melted, and clarified if desired, 

 as in the last formula. To the clear solution add an equal 

 bulk of strong glycerin. 



430. BRANDT'S Glycerin Jelly (Zeit. /. wiss. Mik., ii, 1880, 

 p. 69; Journ. Roy. Mic. Soc., iii, 1880, p. 502). Melted 

 gelatin 1 part, glycerin 1J parts. 



The gelatin to be soaked in water and melted in the usual 

 way. After incorporating the glycerin, the mixture is to be 

 filtered. This is a point of vital importance, as the gelatin 

 of commerce is always mixed with particles of dust and 

 minute threads. Swedish filtering paper does not allow the 

 fluid to pass through sufficiently, and flannel produces more 

 threads than before. BRANDT filters through spun glass 

 pressed into the lower part of a funnel. He describes a 



