Take the finest and most transparent glue, one pound, break it into pieces about the size of a nutmeg; put it into an earthen pot, and pour on it three pints of cold water, let it stand twenty-four hours, stirring occasionally with a stick; then set it over a slow fire for half an hour, or until the glue is perfectly dissolved; skim off the froth from the surface and strain it through flannel; then add the colouring ingredients.
| Red.—Size, one pint—Vermilion, | 3 1/2 ℥. |
| Yellow. | " " King’s yellow, | 2 1/2 ℥. |
| White. | " " Best flake white, | 3 1/2 ℥. |
| Blue. | " " Fine blue smalt, | 6 ℥. |
| Green. | " " Crystallized verdigris, | 2 ℥. |
| " " Best flake white, gamboge, a.a. | 8 ℈. | |
| Black. | " " Lamp-black, | 1 ℥. |
Cold Injections.
Whilst pursuing practical anatomy in the University of Pennsylvania, in the year 1814, under the direction of Professor Wistar, I became acquainted with a material for many years known in that institution under the denomination of “Spalding’s Cold Injection,”[U] used for the purpose of filling the bloodvessels, without the preparatory measure of heating the subject or the injection ingredients—its use exacted great care on the part of the manipulator, and frequently failed; although, when successful, it surpassed all other coarse injections in minuteness. It was composed by grinding white lead and red lead, of each 4 ℥, in a sufficient quantity of boiled linseed oil to form a thick paste, adding, just previously to injecting, turpentine varnish 8 ℥.
Dr. Parsons gives the following formulæ for cold injections. (Vide Parson’s Anatomical Preparations, p. 2.)
“Cold coarse Injections.—This kind consists of colouring matter ground in boiled linseed oil upon a painter’s marble, and made of the consistence of white lead, ground in oil. After being finely levigated, a little lime water, in proportion of two table spoonsful to a pint, is to be incorporated by stirring. At the moment of filling the syringe with the injection, there should be added to it about one-third of its measure of Venice turpentine, which should be stirred quickly, and used immediately, as it very soon hardens. The use of the lime water is to harden the injection; but when white lead (which is almost always adulterated with carbonate of lime) is used, lime water is unnecessary.
“Cold fine Injections.—The same materials will answer, only adding to the Venice turpentine an equal quantity of spirits of turpentine. This is generally thrown in the vessel in small quantities at first, and followed by the above coarse injection.
“Cold minute Injection.—This may be the same as the warm minute injection; or it may consist of vermilion ground very fine in spirits of turpentine, adding a small portion of Venice turpentine, the whole being as fluid as milk, and when thrown in, should be followed by the cold coarse injection.”