OCBSERT ATION* ATTft EXt»EilIMENTS 0l« iPUS/ ^S 



former paper, Phil. Trans. I809, P. II, p. 329*, the t^ 

 suits were similar, except ju the proportion of products. 



1. These exsiccated substances afforded to this men* 

 struum a smaller proportion of potash, but as much animaV 

 oxide and muriate of soda, as mucous sputum. 



2. The uiKlissol ved matter left after repeated digestions in 

 tliis menstruuui afforded the same substances, but in smaller 

 proportions, as mucous sputum. 



3. Equal bulks of fresh pus, and rectified spirit of wine, 

 afford a much thicker and more milky liquor, with a closer 

 sediment, than expectorated mucous matter. 



Sect. V. Agency of acetous Acid. 



The purulent matters mixed with this acid became curdy. Action of ace« 

 and rendered it milky; but on standinj^, a close white sedi- [,ug*^*^^ ^'^ 

 ment appeared, the liquid above being- clear, except in the 

 case of the viscid pus, which exhibited leafy and fibrpus 

 masses, as hath been described with mucous sputum. 



By repeated digestion of the different kinds of pus in this 

 menstruum, I obtained the same results, except the pro- 

 portions of acetite of potash, and muriate of soda being 

 smaller, as related in a former paper on mucous expecto- 

 rated matter, Phil. Trans. 1809, P- H, p. 336 f. 



Sect, VI. Some Experiments with different Objects, espe- 

 cially to distinguish Pus and Mucus* 



1. In the agency of sulphuric, nitric, and muriatic acids, CompavatKc 

 in sufficient quantity to dissolve and decompound the sub- ^'^P^'"^^" ' 

 stances under inquiry, I could perceive no importaut diffe- mucu"-, with 

 rence between them. The purulent matters Indeed ve- mineraUcids, 

 quired a much greater proportion completely to dissolve 

 them, than the transparent sputum. Also the more opaque 

 and dense the sputum, the greater the resistance to dissolu- 

 tion. Sulphuric acid produced black liquids like those con- 

 taining charcoal, smelling strongly of muriatic acid ; but 

 on dilution with water, they became cleai-. No pfecipita- 



• Journal, Vol. XXV, p. 260. 

 ,.;.. t Journal, Vol. XXV, p 266. 



tion 



