PUS. 97 



the odour we may infer the presence of hydrosulphate of am- 

 monia. Vogel examined some ichorous pus from a sore in the 

 foot of a rheumatic patient ; he found perfectly normal pus-cor- 

 puscles in it, and it only differed from normal pus in its greater 

 fluidity. 



Pus of animals. 



I have analysed pus from a lymphatic gland in a horse. There 

 were contained in 1000 parts : 



Analysis 92. 



Water . . . 976-00 



Solid constituents .... 24-00 



Fat, containing cholesterin . . . 1-68 



Water-extract and caseous matter . . 1-26 



Spirit-extract, with lactates, and chloride of sodium . 2-94 

 Albumen, cells, phosphate and sulphate of lime, and 



traces of iron . 17'64 



Gobel 1 has analysed pus from the uterus of a mare ; it was a 

 thick fluid, of a whitish-yellow colour, opaque, of specific gravity 

 1079, and had a faint animal odour : it was neutral, and coagu- 

 lated on the application of heat. It contained, water, 913-3 ; 

 albumen, 7'2; gelatinous non-coagulable animal matter, 9'4; 

 chloride of sodium, lactate and sulphate of potash, phosphates 

 of lime and magnesia, protoxide of iron, and silica, 5 -3. Dumas 

 analysed pus from the frontal sinus of a mule : it reddened lit- 

 mus paper, formed an emulsion with cold water, and when heated 

 to 158, yielded a granular coagulum. It contained 17'9 of 

 solid constituents, of which 16-5 were albumen ; the remainder 

 consisted of extractive matter, free lactic acid, phosphates and 

 sulphates. 



On the formation of mucus and pus on mucous membranes, and 

 on the detection of pus in mucus. 



It seems to be now almost generally admitted that the dis- 

 tinctions between pus and mucus are to be sought for, not in the 

 morphological character or chemical relations of their respective 

 corpuscles, but rather in the chemical peculiarities of the fluid 

 portions of these secretions. 



It has been already shown that the fluid of mucus contains a 

 large quantity of dissolved mucin, while no albumen, or, at the 

 most, a mere trace, is present : on the other hand, the fluid of 

 1 Schweigger's Journal, voL 34, p. 407. 



ii. 7 



