I 



Neutral Salts. 283 



2. Pass the gas through three bottles ; the first containing a 

 little water to absorb any muriatic acid that may come over ; the 

 second the ammonia-water ; and the third filled with lime and 

 water to absorb the superfluous gas, and prevent its getting into 

 the laboratory, it being both highly deleterious and of a very 

 disagreeable smell. Used as a test liquor for metals. 



SUCCINAS AMMONIA LIQUIDUM PYROANIMALE. Unrectificd 



salt of hartshorn 3j, water 5vj ; dissolve, add succinic acid suffi- 

 cient to saturate it ; then filter ; antispasmodic. 



SALTS OF POTASH. 



Rough saltpetre, Sal petrce, Nitrum. Found naturally 

 efflorescing from the earth and certain stones, also from the rub- 

 bish of old buildings : obtained by elixiviation, adding, if neces- 

 sary, wood ashes to supply the alkaline basis : East Indian. 



Refined saltpetr£, Nitre, Sal nitri, Kali Jiiiration, Potasses 

 nitras. Obtained from rough saltpetre, by redissolving it in water 

 and crystallizing. 



2, By adding only a small quantity of water to the rough nitre, 

 letting it remain some time, and draining it off. A cooling diu* 

 retic in small repeated doses of gr. v — x each, every two hours ; 

 taken to 5j it occasions bloody stools, and even death : a small 

 piece dissolved slowly in the mouth frequently stops a sore throat 

 m the beginning; used also in gargles : employed in artillery and 

 fireworks. 



Sore-throat salt, Lapis prunellce, Sal prunellcB. Melt nitre 

 lib., inject upon it gradually flowers of sulphur 2 oz., and pour it 

 out into moulds, either balls or cakes. 



Crystal mixeral. Melt nitre 16 oz., and when it flows 

 smooth, pour it into warm moulds ; yields about 8 oz. 



Macquer's neutral arsenical salt, Arsenate of potash. 

 Kali arsenicatum, Arsenias kali. Distil white arsenic and nitre 

 ana p. aeq. : dissolve the residuum in water, evaporate and crys- 

 tallize : tonic, gr. l-16th to l-4th in pills; used also in preparing 

 cobalt blue. 



Muriate of potash, Hydrocldor ate of potash, Sal febrifugus 

 Siflvii, Spiritus salis marini coayulatus. By saturating spirit of 

 siilt with pearlash, evaporating and crystallizing. 



2. By heating or distilling sal ammoniac and pearlash, dissolv* 

 ing the residuum in water, evaporating, and crystallizing: ape- 

 rient, diuretic. 



Oxymuriate of potash, Chlorate of potash, Potassa* oxymu- 

 rias. Mix common salt 3Ib., manganese ^Ib., and add oil of 

 \itriol ^Ib., previously diluted with water q. a.; distil into a 



