CHAPTER XXII. 239 



paper, and if necessary add more acid till the reaction is decidedly 

 acid. Then add half an ounce of glycerin, two drachms of alcohol, 

 and six drachms of water. I have found this useful, but not so 

 good as the two following. 



495. BE ALE'S Prussian Blue (How to Work, etc., p. 93). 

 Common glycerin .... 1 ounce. 

 Spirits of wine . . . . 1 

 Ferrocyanide of potassium . . .12 grains. 

 Tincture of perchloride of iron . . 1 drachm. 

 Water ...... 4 ounces. 



Dissolve the ferrocyanide in one ounce of the water and glycerin, 

 and add the tincture of iron to another ounce. These solutions 

 should be mixed together very gradually, and well shaken in a bottle, 

 the iron being added to the solution of the ferrocyanide of potassium. 

 Next the spirit and the rest of water are to be added very gradually, 

 the mixture being constantly shaken. 



Injected specimens should be preserved in acidulated glycerin 

 (e.g., with 1 per cent, acetic acid), otherwise the colour may fade. 



496. BEALE'S Acid Prussian Blue (ibid., p. 296). 



Price's glycerin ..... 2 fluid ounces. 



Tinct. of sesquichloride of iron . . 10 drops. 



Ferrocyanide of potassium ... 3 grains. 



Strong hydrochloric acid ... 3 drops. 



Water ...... 1 ounce. 



Proceed as before, dissolving the ferrocyanide in one half of the 

 glycerin, the iron in the other, and adding the latter drop by drop 

 to the former. Finally add the water and HC1. Two drachms of 

 alcohol may be added to the whole if desired. 



I find this excellent. 



497. KANVIER'S Prussian Blue Glycerin Mass (Traite, p. 120). The 

 Prussian blue fluid, 494, mixed with one fourth of glycerin. 



498. THOMA'S Indigo-Carmine (Arch. Anat. Phys., Anat. Abth., 

 1899, p. 270). Dissolve 0'15 grm. sulphindigotate of soda in 50 c.c. 

 water, filter, add 40 c.c. glycerin and gradually, with agitation, 

 10 c.c. of a filtered 10 per cent, solution of sodium chloride in water. 

 If desired, 3 c.c. of a 1 per cent, solution of morphia may be added 

 to dilate arteries. A fine precipitate is formed, which is injected 

 with the mass. 



499. Gamboge Glycerin (HARTING, Das Mikroskop, 1866, 2, 

 Theil, p. 124). Gamboge rubbed up with water and added to 



