ON EXPECTORATED MATTER. , 257 



apparently charcoal, which burned away to the state of a 

 browH earthlike substance, scarcely -y\^ of the wei>^ht of the 

 aubstance subjected to lire, and not above t^'o¥ of the ex- 

 pectorated matter by which it was afforded. It consisted 

 chiefly of phosphate of lime, with indications of carbonate 

 of lime, of a sulphate, of a muriate, of silica, or at least 

 vitrified matter, and of oxide of iron. 



4. The extractlike matter, from the first digestion of the Extract pa'ti- 

 expectorated matter (2, a), by exposure to the air, in a few ^"y dehqu^s- 

 days partially deliquesced, ati'ording no signs of alkales- 



cency, but having u peculiar salt taste. 



(o), A little of this deliquescing part being burnt to dry- Treated witk 

 ness, with a large proportion of nitrous acid, on beginning nitrous aci4. 

 to be ignited, it deflagrated, leaving a blackish saline residue; 

 which soon deliquesced, and being lixiviated, it precipitated 

 supertartrate of potash with tartaric acid, and gave a red- 

 dish precipitate with nitro-muriate of platina. The resi- _ 

 due also contained lime, for the dissolution in acetous 

 acid afi^brded oxalate of lime, on the addition of oxalate of 

 ammonia. 



(6). This extractlike matter, (2, a), by digestion in rec- Digested i« 

 tified spirit of wine, gave a blackish tincture, which, being ^ '^^ "" 

 decanted and evajjorated, left a residue. This became 

 quite liquid after twenty-four hours exposure to the air. It 

 consisted chiefly of acetite of potash, with an inappreciable 

 portion of muriate of soda, and ammonia neutralized, pro- 

 bably, by phosphoric acid ; beside uncoagulable and unge- 

 latinizable oxide of animal substance, 



(c). The undissolved matter by spirit of wine, just spoken Residuum. 

 of (6), after expression, being desiccated, \\ remained in a 

 solid state after exposure to the air, only growing a little 

 soft in four weeks time. By combustion, it afforded a dif- 

 ficultly fusible ash, which after fusion was found to consist 

 c iefly of phosphate of lime, muriate of soda, with a little 

 potash; a sulphate, traces of irow, and vitrified matter, 

 which probably contained silica united to the other sub- 

 V, *t uices tnaniiested in this fused mass. 



5. The extractlike matter, by acetous acid on the second E> tract iv.r*. 

 di"-estion (J il, srew soft, but did not deliciuesce on expo- ^'''^ -^ ^'.-s- 



\ / ' o tl iH, 



sure to the air. It was found to differ iroin the matter ob- 



i ' taiaed 



