INJECTIONS OTHER MASSES (COLD). 309 



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. The mass runs 

 Avell, and has not so much tendency to exude from cut capil- 

 laries as might be supposed. Unfortunately it is a rather 

 expensive preparation. 



503. RAXVIEE'S Prussian Blue Glycerin Mass (Traite, p. 120). 

 Consists of the Prussian blue fluid, 490, mixed with one fourth of gly- 

 cerin. 



504. Other Colours. Any of the colouring masses, 480 to 482, or 

 other suitable colouring masses, combined with glycerin, either dilute or 

 pure. 



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

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

 to glycerin ; or a saturated alcoholic solution of gamboge 

 added to a mixture of equal parts of glycerin and water. 

 Any excess of alcohol may be got rid of by allowing the 

 mass to stand for twenty -four hours. 



Aqueous Masses. 



506. RANVIER'S Prussian Blue Aqueous Mass (Traite, p. 120). 

 The soluble Prussian blue, 490, injected without any 

 vehicle. It does not extravasate. 



507. MULLER'S Berlin Blue (Arch. f. mik. Anat., 1865, p. 

 150). -Precipitate a concentrated solution of Berlin blue by 

 means of A to 1 volume of 90 per cent, alcohol. 



The precipitate is very finely divided ; and the fluid may 

 be injected at once. 



508. MAYER'S Berlin Blue (Mitth. Zool. Stat. Neapel, 1888, 

 p. 307). A solution of 10 c.c. of tincture of perchloride of 

 iron in 500 c.c. of water is added to a solution of 20 gr. of 

 yellow prussiate of potash in 500 c.c. of water, allowed to 



