APPENDIX. 445 



one gallon. Dissolve the acetate of lead in six pints of water, and 

 strain, and to them add the iodide of potassium previously dis- 

 solved in two pints of water. Wash the precipitate thrown down, 

 and dry. 



Use, — It is used in the form of an ointment. 



Liquor Potasscc effervescens. Effervescing Solution of Potass. — 

 Take of bicarbonate of potass one drachm, distilled water one 

 pint ; dissolve the bicarbonate of potass in the water, and trans- 

 mit through it a quantity of carbonic acid, forcibly compressed, 

 more than is sufficient for saturation. Keep the solution in a 

 well-stopped vessel. 



Liqujor Potassii lodidi Compositus. Compound Solution of Iodide 

 of Potassium. — Take of iodide of potassium ten grains, iodine five 

 grains, distilled water one pint ; mix that they may be dissolved. 



Use, — This has been found serviceable in cases wherein iodine 

 is indicated. Its dose is from niiij to »lvij. 



MorphicB Acetas. Acetate of Morphia, — Take of morphia six 

 drachms, acetic acid three fluid drachms, distilled water four 

 fluid ounces ; mix the acid with the water, and pour it on the 

 morphia until it is saturated. Let the solution be evaporated by 

 a gentle heat, so that crystals may form. 



Use. — This is used where opium is indicated. It may be given 

 in the dose of from gr. ^ to ij. It is considered to be the basis of 

 Battley's Liquor Opii Sedativus. 



MorphicB hydrochloras, Hydrochlorate of Morphia. — Take of 

 opium, cut up into bits, one pound ; crystals of chloride of lead 

 two ounces, or a sufficient quantity ; purified animal charcoal 

 three ounces and half; hydrochloric acid, distilled water, solution 

 of ammonia, of each a sufficient quantity. Macerate the opium in 

 four pints (>f the distilled water for thirty hours, and pound it; 

 then, when it has been digested for twenty hours more, express 

 it. Macerate what remains for a second and a third time in water, 

 so that it may be tasteless, and pound it and express it each time.. 

 Evaporate the mixed licjuors by a heat of 140 to the consistence 

 of s>Tup. Then add three pints of distilled water, and, when all 

 the ffTces have sul)sided, pour off the supernatant liquor. To this 

 add gradually two ounces of chloride of lead, previously dissolved 

 in four pints of boiling distilled water, or a sufficient quantity, until 

 nothing more is thrown down. Pour off the liquor, and wash 

 the residue repeatedly with distilled water. Then, having mixed 

 the liquors to;^ether, evaporate, as before, by a gentle heat, and 

 set aside, that crystals may form. Press these in a linen cloth ; 

 then dissolve in a pint of distilled water, and digest with one 



