ON LARD, AND COMPOUNDS MADE WITH IT. 1 Qg 



was copiously preclpitatecl by acetate of lead. Evaporated 

 to the conslbteijce oi'a sirup, it was divested of colour by the 

 nitric and muriatic acids> which formed in it a whitish pre- 

 cipitate ; iuid on pouring in the acid a very rancid smell was 

 perceived. , - 



Barytes water acts on the oxigenized lard more effectually, and more effcjc- 

 Theoranj^e yellow colour it acquires from it is equally de- ^"^^*y "7 °^'' 

 stroyed by acids. I poured in a quantity of sulphuric acid 

 sufficient to take up the barytes, boiled the whole, and fil- 

 tered it at a boiling heat. The filtered liquor, which con- 

 tained nT> barytes, was evaporated in great part on a sand 

 heat. Small slender needles crystallized from it, inter- 

 spersed with silkv tufts. These were insoluble in alcohol, 

 did not precipitate lime water, and were not sublimable in 

 close vessels. 



- If lard be boiled in concentrated nitric acid, and the ebul- Bailing niirjc 

 lition be continued, addinp^ water occasionally, a crystalline verulenrcfr" 

 White powder forms in it on cooling. This powder is rough tals, 

 'to the touch, insoluble in alcohol, and much more soluble in 

 hot water than in cold. Uy its combinations with diflerent which are' sac- 

 bases, and other characters, I satistied myself, that it was ^^^'^^^'^^'c acid. 

 tnucous acid*. 



Lard thus oxigenized at a maxii;!;iiim is soft, of a brown L^^j-d oxi«^eii- 

 colour, perceptibly soluble in water, and vejy soluble in al- i-'^d at a maxi 

 cohol. The water in which it was washed being saturated "^""^' 

 by potash, the result was a foliated salt, attracting humidity Affords acetic 

 from the air, and giving out acetic acid mi treating it with '^^^''^' 

 sulphuric f. The precipitate ibrmed by acetate of lead in 

 this water is nothing but the lard itself, which combines 

 with the oxide of" lead, and carries down with it a little mu- 

 cous acid. The former swims on the surlace, when the pre- 

 cipitate is decomposed by sulphuric acid. . " 



Oxigetrlzed lard being very soluble in alcohol, a large 

 quantity may be precipitated from it by water. By the 

 powerful action of concentrated nitric acid on lard a certain Nitrate of ani* 

 quantity of nitrate. of ammonia is forujed,; as may be seen "^<^^»^ ^o'^*^- 



* Beef, suet, though, it decomposes ftitrie -acid less powerfully, like- 

 wise affoids mucous aCid. 



f Rancid fat and'very" old suet likewise afforded Mr. Vogel acetic acid, 

 when treated in the same mauner. * • 



by 



