CHAPTER XIX. 223 



3. HANTSCH'S LIQUID. Glycerin 1 part, alcohol 3, water 2. 



4. JAGER'S LIQUID (Vo-GT and YuNG'&Traited'Anat. Comp. Prat., 

 p. 16). Glycerin 1 part, alcohol 1, sea water 10. 



Glycerin Jellies. 



432. Glycerin Jellies have a higher index than pure glycerin, and 

 set hard enough to make luting unnecessary, though it is well to 

 varnish the mount. To use them, you melt a small portion on a 

 slide, introduce the object (previously soaked in water or glycerin), 

 and cover. They seem very plausible, but for delicate work I do 

 not recommend them, and should advise instead either pure glycerin 

 or euparal. 



433. LAWRENCE'S Glycerin Jelly (DA VIES, Preparation and Mount- 

 ing of Microscopic Objects, p. 84). Soak some gelatin for two or 

 three hours in cold water, pour off the superfluous water, and heat 

 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. Boil until 

 the albumen coagulates and the gelatin is quite clear, and to each 

 ounce of the solution add 6 drachms of a mixture composed of 

 1 part of glycerin to 2 parts of camphor water. 



434. BRANDT'S Glycerin Jelly (Zeit. wiss. Mik., ii, 1880, p. 69). 

 Melted gelatin 1 part, glycerin 1J parts. The gelatin to be soaked 

 in water and melted as above. After incorporating the glycerin, 

 filter through spun glass pressed into the lower part 'of a funnel. 

 He describes a simple arrangement for keeping the funnel warm 

 during the filtering (see early editions). Some drops of carbolic acid 

 should be added. 



435. KAISER'S Glycerin Jelly has been given 155. 



436. SQUIRE'S Glycerin Jelly (SQUIRE'S Methods and Formula, 

 etc., p. 84). Soak 100 grms. of French gelatin in chloroform water, 

 drain when soft, and dissolve with heat in 750 grms. of glycerin. 

 Add 400 grms. of chloroform water with which has been incorporated 

 about 50 grms. of fresh 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. 



437. HEIDENHAIN (Zeit. wiss. Mik., xx, 1905, p. 328) takes of 

 gelatin 9 parts, glycerin 7, and water 42, and to the filtrate adds 

 drop by drop 14 parts of absolute alcohol . 



438. FISCHER (ibid., xxix, 1912, p. 65) takes 5 grms. of borax 

 dissolved in 240 c.c. of water and adds 25 c.c. of glycerin. To this 



