^26 ESSAYS AND OBSERVATIONS 



led, or in a fpeedy way, when particular 

 caufes concur to haften it. The urina- 

 ry bladder was, by the ancients, reckon- 

 ed the coldeft of all the vifcera, deriving 

 its heat principally from the furrounding 

 parts i and, being fupplied with few blood- 

 veflels, was faid to be exfangtiis. As, 

 therefore, there can be but a fmall force 

 of circulation from arteries, the motion 

 of the fluids in thofe very minute vef- 

 fels of which it is compofed will be pro- 

 portionably flow. And, when there is a 

 languid circulation of the fluids in ge- 

 neral, as in old age, or a bad habit, thofe 

 juices, which are defined for the nourifli- 

 ment of the part, and the fecretions to 

 be made in it, become fliill flower in 

 their motion ; and, in time, there will be 

 an accretion. Hence, a gradual thick- 

 ening of the coats of the bladder, which 

 notwithflianding may continue to perform 

 its ufual fundions. Veficas urinae mul- 

 tas crajfefa^as et duras 'uidij fays Guari- 

 nonius, quae non, nift ad morbi hujus cumur 

 lum, Juam operam excernendae accipiendaeque 

 urinae^ amij^JfenL 



To 



