232 0 ?t the Ajitmal Calculus. 
mcnt it might fuft'cr from the PreflTure of the 
Bowels. But he was eafed, he fays, of this Fear, 
when he found two Perfons who lay conftancly, 
the one on the right and the other on tho 
left Side, and yet were neither of them trou- 
bled with Calculi, in thofe lower Kidnies, 
but one of them in the upper. But notwith- 
ftanding this and fome other like Inftances 
that I have known, yet it Teems from the a- 
bovementioned Reafons, moft likely that the 
lower Kidney fliould be moft liable to breed 
Sand and Gravel. 
ly. Many obferving one Kidney to be free 
from Calculi and the other not, concluded it 
was owing to the different Soundnefs of the 
Kidnies; Tome alledging that the excretory 
T^u£ls in the morbid Kidney were too nar- 
row, others that it was too much relaxed ; 
which they are often found to be : Which 
Relaxation may probably be owing to ftopping 
the Secretion of Urine, and to a long Series 
of Pain from the Calculus, not that the Re-t 
laxation was the antecedent Caufe, but the 
Effect of the Calculus. 
Experi- 
