INJECTIONS OTHKU MASS MS (c<)M>). 265 



10 per cent (or more) of sodium salicyltite will retard the 

 setting of gelatin for hours at normal temperatures. 



Any of these masses may be made to set in the tissues by 

 means of weak formol. 



Glycerin Masses. 



503. Bu ALE'S Carmine Glycerine Mass (How to Work, etc., 

 p. 95). Five grains of carmine are dissolved in a little water 

 with about five drops of ammonia, and added to half an 

 ounce of glycerin. Then add half an ounce of glycerin with 

 eight or ten drops of acetic or hydrochloric acid, gradually, 

 with agitation. Test with blue litmus 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. 



504. BKALH/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. 



505. 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. 



