444 APPENDIX. 



Use. — This is too dangerous a preparation for internal exhibi- 

 tion. An ointment has been made of it in the proportion of one 

 grain to a drachm of hog's lard in neuralgic affections. 



Carlo Animalis purificatus. Animal Charcoal purified. — Take 

 of animal charcoal one pound ; hydrochloric acid, water, of each 

 twelve fluid ounces : mix the hydrochloric acid with the water, 

 and pour it gradually on the charcoal ; then digest for two days 

 with a gentle heat, occasionally shaking it. Set aside, and pour 

 off the supernatant hquor ; then wash the charcoal with water fre- 

 quently renewed, until no acid can be perceived ; lastly dry. 



Use, — This is employed to deprive the alcaloids, hc.j of foreign 

 colouring matter. 



Argenti Cyanidum, Cyanide of Silver. — Take of nitrate of silver 

 two ounces and two drachms ; dilute hydrocyanic acid, distilled 

 water, of each a pint ; dissolve the nitrate of silver in water, and 

 add the dilute hydrocyanic acid, and mix. Wash the precipitate 

 with water, and dry. 



Use. — Sometimes used for the preparation of hydrocyanic acid. 



Hydrargyri Bicyanidum. Bicyanide of Mercury. — Take of per- 

 cyanide of iron eight ounces, binoxide of mercury ten ounces, 

 distilled water four pints; boil together for half an hour, and 

 strain. Evaporate the liquor, that crystals may form. Wash the 

 residue frequently with boiling distilled water, and, the liquors 

 being mixed, evaporate again, that crystals may form. 



Hydrargyri lodidum. Iodide of Mercury. — Take of mercury 

 one ounce, iodine Hve drachms, alcohol as much as may suffice ; 

 rub together the mercury and the iodine, the alcohol being added 

 gradually, until the globules are no longer seen. Dry the powder 

 as soon as possible by a gentle heat, excluding the hght, and 

 keep it in a well-stopped vessel. 



Use, — This is used in making an ointment for inveterate vene- 

 real ulcers. The proportions are 20 grains of the iodide to 1^ 

 ounce of lard. 



In preparing the biniodide of mercury double the quantity of 

 iodine is used with the same quantity of mercury, and it is em- 

 ployed in the same cases. An alcoholic solution of it is also 

 employed in the treatment of scrofulous affections combined 

 with .syphilis. The proportions are, alcohol at 36° one ounce and 

 a half, biniodide of mercury 20 grains. The dose of the solution 

 is 10, 15, or 20 drops in a glass of distilled water. 



Plumbi lodidum. Iodide of Lead. — Take of acetate of lead 

 nine ounces, iodide of potassium seven ounces, distilled water 



