280 SOLID PARTS OF ANIMALS. 



which tannin precipitates from the extract obtained by anhydrous 

 alcohol. It constitutes but a small portion of that extract. 



(2.) When diacetate of lead is poured into the liquid, which 

 has been precipitated by corrosive sublimate, and which contains 

 an excess of this last substance, a small quantity of a yellowish 

 precipitate falls quite similar to what urine furnishes in a similar 

 case. This precipitate consists of dichloride of lead with a little 

 dilactate of lead, both united to an extractive matter. If we wash 

 this precipitate and decompose it by sulphuretted hydrogen, we 

 obtain a yellowish liquid which has an acid reaction. If we sa- 

 turate this liquid with carbonate of lead, evaporate to dry ness, 

 digest the residual matter in alcohol, drive off the alcohol, and 

 decompose the residue by sulphuretted hydrogen and evaporate, 

 we obtain a yellow transparent matter, which contains a little 

 free lactic acid, exhales a weak urinous smell when evaporated, 

 and is not precipitated by any of the reactives above stated. It 

 combines with chloride of barium, and with other salts, precisely 

 as the corresponding matter from urine does. 



The portion of the alcoholic extract insoluble in absolute al- 

 cohol is a viscid mass having a deep yellow colour, and general- 

 ly opaque. It is no longer completely soluble in alcohol of 

 0*833. That alcohol dissolves a portion of it, and assumes a yel- 

 low colour. When evaporated, it leaves an extract, mixed with 

 a combustible salt. It has no determinate taste. When heat- 

 ed cautiously till it begins to become brown, it gives out the 

 smell of roast-meat. If we now dissolve it in water, and treat it 

 with animal charcoal, most of the extract is separated from the 

 salt, which, after evaporation, remains in the state of a white mass, 

 consisting of soda and potash united to a combustible acid, but 

 without any salt of lime. The extractive matter when in solu- 

 tion is very slightly precipitated by infusion of nutgalls and cor- 

 rosive sublimate, and not at all by acetate of lead and protochloride 

 of tin. This extractive is the same as that which urine gives 

 under the same circumstances. 



The portion which the alcohol of 0*833 leaves undissolved has 

 a deep-brown colour, and is mixed with crystals of common salt 

 It dissolves in water, and the solution has a brown colour. This 

 extract consists of two substances, one^of which is precipitated by 

 corrosive sublimate, and the other by protochloride of tin. 



The precipitate by corrosive sublimate is deep-brown, and the 



