234 INJECTIONS. 



Dissolve the ferrocyanide in 1 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 solu- 

 tion of the ferrocyanide of potassium. Next, the spirit and 

 the water are to be added very gradually, the mixture being 

 constantly shaken." 



" The water " spoken of in the last sentence appears to 

 mean the remaining 3 ounces of water that were not mixed 

 with the glycerin at first. 



Injected specimens should be preserved in acidulated gly- 

 cerin, otherwise the colour may fade. 



477. Beale's Acid Prussian Blue Glycerin Mass (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 directed above, 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 consider this a most admirable formula. I possess some 

 of this mass prepared many years ago, in which not the 

 smallest flocculus has made its appearance. The Prussian 

 blue appears to be in a state of true solution. The mass runs 

 well, and has not so much tendency to exude from cut 

 capillaries as might be supposed. 



478. Ranvier's Prussian Blue Glycerin Mass (Traite',p. 120). 

 Consists of the Prussian blue fluid, 449, mixed with one 

 fourth of glycerin. 



479. Other Colours. Any of the colouring masses, 434 

 to 438a, or other suitable colouring masses, combined with 

 the vehicle 475. 



