ON MINUTE INJECTIONS. 161 



of various sizes. This is used by placing the end of the pipette 

 in the mouth, and exhausting the air on forcing the fluid in the 

 vessels. 



To prepare the material for injecting: Take of the finest 

 and most transparent glue, one pound; break it into small 

 pieces, put it into an earthen pot, and pour on it three pints of 

 cold water; let it stand twenty-four hours, stirring it now and 

 then with a stick ; then set it over a slow fire for half an hour, 

 or until all the pieces are perfectly dissolved J skim off the froth 

 from the surface, and strain through a flannel for 'use. Isin- 

 glass, and cuttings of parchment make an excellent size, and 

 are preferable for very particular injections. 



The size thus prepared may be colored with any of the fol- 

 lowing: 



Red. To 1 pint of size, 2 ounces of Chinese vermilion. 



Yellow. Size, 1 pint, -chrome yellow, 2J ounces. 



White. Size, 1 pint, flake-white, 3J ounces. 



Blue. Size, 1 pint, fine blue smalts, 6 ounces. 



It is necessary to remember that whatever coloring matter is 

 employed, must be very finely levigated before it is mixed with 

 the injection. This is a matter of great importance, for a 

 small lump or mass of color, dirt, &c., will clog the minute 

 vessels, so that 'the injection will not pass into them, and the 

 object will be defeated. 



The mixture of size and color should be frequently stirred, 

 or the coloring matter will sink to the bottom. 



Respecting the choice of a proper subject for injecting, it 

 may be remarked, that the injection will usually go farthest in 

 young subjects; and the more the creature's fluids have been 

 exhausted in life, the greater will be the success of the injec- 

 tion. 



Owing to the contraction of the vessels, it is necessary to 

 wait from one to three days after death before attempting the 



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