INJECTION GELATIN MASSES. 299 



479. ROBIN'S Glycerin-gelatin Vehicle (Traite,p. 32). Dis- 

 solve in a water-bath 50 grins, of gelatin in 300 grms. of 

 water, in which has been dissolved some arsenious acid ; 

 add of glycerin 150 grms., and of carbolic acid a few drops. 

 Unlike the pure gelatin vehicles, this mass does keep in- 

 definitely. 



The colouring masses recommended for combination with 

 the vehicles above described are given in 480 to 483, and 

 497. 



FRANKL (Zeit.f. wiss. Zool., Ixiii, 1897, p. 28) prepares a similar vehicle, 

 and adds to it a little solution of corrosive sublimate and a crystal of 

 thymol. 



480. ROBIN'S Carmine Colouring Mass (Trait*', p. 33). Rub 

 up in a mortar 3 grms. of carmine with a little water and 

 enough ammonia to dissolve the carmine. Add 50 grms. of 

 glycerin, and filter. 



Prepare 50 grms. of acid glycerin (containing 5 grms. of 

 acetic acid for every 50 grms. of glycerin), and add it by 

 degrees to the carmine-glycerin, until a slightly acid reaction 

 is obtained (as tested by very sensitive blue test-paper, moist- 

 ened and held over the mixture). 



One part of this mixture is to be added to 3 or 4 parts of 

 the gelatin injection vehicle (ante, 478), or of the glycerin- 

 gelatin (479). 



481. Ferrocyanide of Copper Colouring Mass (ibid., p. 34). 

 Take- 



(1) Ferrocyanide of potassium (concentrated 



solution) . . . . .20 c.c. 



Glycerin . . . . . . 50 ,, 



(2) Sulphate of copper (concentrated solu- 



tion) . . . . 35 ,, 



Glycerin . . . . . 50 



Mix (1) and (2) slowly, with agitation; at the moment of 

 injecting combine with 3 volumes of vehicle. 



482. Blue Colouring Mass (Prussian Blue) (ibid., p. 35, and 

 2nd ed., p. 1013). 



