[ 2 59 3 
extremely fore, and tender, that, at length, on the 
24th of September laft, upon his getting out of bed, 
a laceration thereof happened i and the flone, here- 
with fnewn to this learned Society, was voided, falling 
down upon the floor. 
Five days after this happened, I went to fee the 
patient, in order to get a perfect knowledge of the 
circumftances of the fad j the particulars of which I 
then communicated to my worthy friend Mr. Warner, 
furgeon, of Guy’s hofpital in London ; who returned 
me a fatisfadory account, from his own obfervations, 
of the manner by which a flone is contained in the 
urethra, &c. which I fhall take the liberty of infert- 
ing, after fubmitting to the fuperior judgment of this 
Society, a fhort account of what I apprehended to be 
the original procefs of nature, in the produdion of 
fuch a phenomenon. 
Dr. Boerhaave hath obferved, from experiment, 
that if a quantity of recent urine be fet, to digefl in a 
tall glafs, with a heat no greater than that of a healthy 
man’s body, for the fpace of three or four days, it 
will continually grow more and more red, foetid, ca- 
daverous, and alkaline, throwing off a ffony matter 
to the tides of the veffel. From whence we learn, 
that calculous matter, by too long a detention of this 
excrementitious fluid in the bladder, may be eafily 
generated ; and a fmall portion thereof, in its dis- 
charge from thence with the urine, may happen to 
be obftruded in the paffage of the urethra, fo as to 
be incapable of getting either forward or backward, 
and thereby become the bafis of a flone j which, in- 
creating bv the urinous fupplies, may be accumulated 
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