AND ANIMAL LIFE. 205 



of the body. Phlegmonous inflammations are 

 sometimes accompanied by great heat of their in^ 

 dividual surface. If the temperature should rise 

 above the standard of the system, a point which 

 is yet disputed, I do not see that we are author- 

 ized to suppose that the additional degree is to 

 be attributed to a power of generation belonging 

 to the blood-vessels of the part, but, in a great 

 measure, to diminished evaporation. 



In physics, accelerated motion produces heat ; 

 but there is a great difference between animate 

 and inanimate particles and the laws which re- 

 spectively regulate them. 



We are frequently justified, from obvious re- 

 semblance, in applying the same general reason- 

 ing to both, but we often err in endeavouring to 

 draw analogies where no similarity exists. 



CCXXIX. There is certainly a difference in 

 the results between diminished evaporation afc. 

 fecting the whole surface of the body, and a sin- 

 gle part. In the former instance, the whole cir- 

 culating fluid becomes deranged in its quality 

 and motion ; in the latter, its own vessels, of what 

 kind soever, are, generally speaking, principally 

 if not exclusively disordered. If symptomatic 

 fever occur in these cases, it is as easily explained 

 on the supposition of diminished evaporation as 

 of increased generation of heat. In both cases 

 the temperature of the vital fluid is augmented, 

 and this condition of the blood is communicated 



