OF FARRIERY. 



513 



means of a red-hot iron, and the door in- 

 stantly closed. 



Decomposition. — The sulphur burning in 

 the atmospheric air of the chamber, forms 

 sulphuric acid gas. The nitre gives rise to 

 the nitric oxide, which with the oxygen of 

 the air produces nitrous acid gas. These two 

 gases, from the moisture present, form a white 

 solid, which is instantly decomposed in the 

 water, when the nitrous acid reverts to the 

 state of nitre oxide, having transferred one 

 additional proportion of oxygen to the sulphu- 

 reous acid, forming sulphuric acid, which 

 uniting with the water, forms liquid sulphuric 

 acid. 



Medicitial Uses. — Caustic and stimulant, 

 applied externally, but not very often used 

 alone, entering more into combinations. 



ALUMlNyE ET POTASSiE SUPER 

 SULPHAS. 



SUPER SULPHATE OF ALUM AND POTASH. 



This is a salt of alum. Potash and sulphu- 

 ric acid is found native in some places ; but 

 the greater quantity of the alum commerce is 

 prepared from alum ores ; by exposing them to 

 the atmospheric air, the oxygen of which 

 uniting to the sulphur of the sulphurite of iron 

 present, becomes converted into sulphuric 

 acid, and the combining with the alumine, 

 the alum effloresces ; this is subsequently 

 evaporated, and then set aside to crystallize. 



Medicinal Uses. — Astringent, this is only 

 used for the Horse as any external applica- 

 tion in the formula. 



ACONITI FOLIA. 



LEAF OF ACONITE, OR MONK's HOOD. 



This is a perennial plant, cultivated in our 

 gardens, flowering in June, but found native 



in the mountainous parts of Germany. Jt 

 should be gathered when the Howers appear. 

 Medicinal Uses. — This, like all the other 

 narcotics of the human subject, produces no 

 such effect in the Horse. In doses of one and 

 a half to two drachms, repeatedly given, it 

 will produce efforts to vomit, accompanied 

 with much general irritation. 



AUEPS. 



THE FAT OF HOGS. 



Its uses are emollient, and used for the for- 

 mation of ointment, 



ALOES CABALLINA. 



HORSE ALOES ARE CAPE ALOES. 



ALOE SPICATA. 



SPIKED, OR SOCOTRINE ALOES. 



ALOE VULGARIS EXTRACTUM. 



COMMON, Oa BARBADOES ALOES. 



The general nature of these three kinds of 

 aloes are nearly the same, the difference being 

 the different proportions of the extracted 

 gummy matter compared with the resinous. 

 The smell and taste reside principally in the 

 extracted matter as to their virtues, the resin 

 being nearly inert. 



The leaves of the plant are cut off, ex- 

 pressed, and the juice evaporated in the sua 

 till of a fit consistence, which is then put into 

 packages. 



True Socotrine aloes are very scarce. It 

 comes over into this country wrapped in skins 

 from the island of Socotra. That which is 

 now sold for Socotrine, is the produce of the 

 spiked aloe of the Cape of Good Hope. 



The term Caballina applied to the Cape 

 aloes, is for the sake of distinction, although it 

 is thought the same plant yiekU this, and 

 60 



