498 APPENDIX. 



PLASTER-OP-PARIS INJECTION. 



Preparation. Rub up fine plaster of Paris with water, in a 

 mortar, to the consistency of thin cream. Colour to the 

 required tint with carmine injection fluid, good vermilion 

 or with French blue. Strain through fine muslin. Starch 

 may be used in place of the plaster. 



Use. For injecting blood-vessels, &c., of rabbits and other 

 large animals. It must be used immediately after pre- 

 paration. (See Introduction, p. xxiii.) 



GELATIN INJECTION. 



Preparation. Soak gelatin in warm water till thoroughly soft. 

 Pour off the superfluous water : melt, and stir into it 

 carmine injection fluid, or other insoluble colouring 

 substance, and a trace of carbolic acid ; or if preferred 

 the gelatin may be soaked in camphor water, and carbolic 

 acid is then unnecessary. Stir till almost cold. The in- 

 jection is solid when cold. 



Use. For injection of specimens of which it is proposed to 

 make sections. It is to be melted, and kept well stirred 

 during injection. If the specimen is large or difficult to 

 inject, the whole operation must be performed in a vessel 

 of water as hot as the hand can bear it. 



WH3TE-0F-EGG INJECTION. 



Preparation. Rub up fresh white of egg with carmine injec- 

 tion, or other colouring fluid which will not cause coagu- 

 lation of the albumen. 



Use. For injection specimens of which sections are to be cut. 

 It is used fresh, and the specimen is then placed in alcohol, 

 or in hot water, to coagulate the albumen. 



GUM INJECTION. 



Preparation. Make a thick mucilage of gum arabic in cold 

 water. 



Use. Inject cold, previously colouring as desired. Plunge 

 the specimen into alcohol, and the injection will solidify. 



