CHAPTER XXIII. 



INJECTIONS OTHER MASSES (COLD). 



498. JOSEPH'S White-of-Egg Injection Mass (Carmine) (Ber. 

 naturw. Sect. Schles. Ges., 1879, pp. 36 40; Journ. Roy. Mic. 

 Soc. [N. S.], ii, 1882, p. 274). "Filtered white-of-egg, 

 diluted with 1 to 5 per cent, of carmine solution. . . . This 

 mass remains liquid when cold ; it coagulates when immersed 

 in dilute nitric acid, chromic or osmic acid, remains trans- 

 parent, and is sufficiently indifferent to reagents." 



For Invertebrates. 



499. BJELOUSSOW'S Gum Arabic Mass (Arch. f. Auat. u. 

 Phys., 1885, p. 379) . Make a syrupy solution of gum arabic 

 and a saturated solution of borax in water. Mix the solu- 

 tions in such proportions as to have in the mixture I part of 

 borax to 2 of gum arabic. Rub up the transparent, almost 

 insoluble mass with distilled water, added little by little, then 

 force it through a fine-grained cloth. Repeat these opera- 

 tions until there is obtained a mass that is free from suspended 

 gelatinous clots. (If the operation has been successful, the 

 mass should coagulate in the presence of alcohol, undergoing 

 at the same time a dilatation to twice its original volume.) 



The vehicle thus prepared may be combined with any 

 colouring mass except cadmium and cobalt. 



After injection the preparation is thrown into alcohol, and 

 the mass sets immediately, swelling up as above described, 

 and consequently showing vessels largely distended. 



Cold-blooded animals may be injected whilst alive with 

 this mass. It does not flow out of cut vessels. Injections 

 keep well in alcohol. Glycerin may be used for making 

 them transparent. 



If it be desired to remove the mass from any part of a 



