ON EXPECTORATED MATTr.R. 



Q69 



On Incineration, however, the alkali was denuded, and 

 fusion WHS easily produced. 



An equal portion of the animal oxide, of the same parcel Animal cxide 

 as in the last experiment, was digested in spirit of wine, in colfoi*^* "i a - 

 the same rircamstances as this oxide united to potash. It 

 imparted no colour to the spirit, and the extract obtained * 



was in smaller quantity, than in the preceding experiment. 

 Being evaporated to dryness, the residue did not grow 

 moist, but it became a little soft on exposure to the air. 

 Being exposed to. tire, it left an inconsiderable propor- 

 tion of infusible residue, with barely trances of alkali and 

 muriate. 



2, To determine, by a more satisfactory experiment tlian pxamm t' 

 a preceding one, whether or not acid was united to the for acid. 

 potash and evaporable, ten ounces of watery liquid, which 

 separates from the curd on boiling expectorated matter, 



were evaporated to the consistence of a thin extract. This 

 matter indicated neither acid nor alkali in a disengaged 

 state, but it was ascertained to contain a large proportion 

 of potash combined; and an acid smell was perceived on 

 heating it with phosphoric or tartaric acid. Ten drops of 

 liquid phosphoric acid were mixed with four hundred grains 

 of this extractlike matter, and at a low tem])erature it was 

 subjected to distillation to become almost a dry substance ; 

 but no acid could be detected in the liquid which came 

 over, nor did this dry substance indicate any acidity to the 

 visual reagents— neither on exposure to the air did it, as 

 before the addition of acid, grow moist. Phosphoric acid 

 was farther added, till it became sensible to the test of 

 turnsole; but neither by elutriation nor distillation could 

 any acid be obtained, except a small portion of the phos- 

 phoric acid by elutriation, the rest having united to the 

 potash. 



3. To furnish an estimate of the proportion of ammonia, Very little am- 

 I subjected to distillation a mixture of a pint of expecto- Hio"'a. 

 rated matter of the fifth kind, page 232, with three ounces 



of well burnt lime, but I could not reckon the ammonia in 

 the distilled liquid at more than two cubic inches, or less 

 than half a grain in weight. 



Sect. 



