OBSERVATIONS AND EXPERlMiENTS ON PUS. J^ 



specific s^ravity was the same as that of" the first sort. In 

 other properties it was similar to the creamlike pus above 

 distinguished. 



IV. A. piiit of the viscid pvs was obtained from an ab- atidcf the4th, 

 scess amooj^- ihe muscles of the thigli. If 1 had cot had 

 entire confidence in Mr. Brodie's accuracy, who v/as so 

 obligiog, as to attend to my request, on this and many 

 other like occasions, I should have supposed, that this was 

 expectorated matter, it so exactly resembled in its simple 

 properties the ropj/ kind, described in a paper on expecto- 

 rated matter. Phil. Trans. 1 SOt), P. II, p. 317*. 



The appearance was not quite uniform, there being semi- 

 transparent masses in small proportion, mixed with tbe 

 perfectly opaque white matter. It was almost inodorous, 

 To the touch it was quite smooth. The specific gravity 

 was nearly that of the second kind of pus. 



On standing 24 hours, about one ounce measure of lim- 

 pid fluid rose to the top of the whole mass. Putrefaction 

 did not take place so soon ^s in expectorated matter of lh€> 

 same consistence. 



The examination by the inicroscope manifested innume- 

 rable spherical particles amor.g leafy masses, and numerous 

 particles of irregular forms. 



The simple properties were otherwise similar to those of 

 the other sorts of pus, above distinguished. 



Many other differences of purulent matter are universally Othet diffs* 

 recognized ; b-ut they are either varieties of the four kinds 

 already named, or the differences depend upon the obvious 

 mixture with adventitious substances; such as the red part 

 of the blood, coagulated lymph, serum, putrefied matter, 

 fibrous and membranous masses, calculi, &c. : therefore, I 

 deem it useless to describe them. 



Sect. II. Agency of Calorit;, 



1. The above kinds of pus coacrulated like serum of Action of hea? 

 blood, into a firm, uniform, foft solid, at the temperature ^"P"*' 

 of lj65° completely ; but partially at l6o° of Fahrenheit's 

 thermometer. 



* Sea Journal, Vol XXV, p. £20. 



C 2 2, The 



