[ ] 
The Somerffiam water, therefore, is a chalybeate 
water, ftrongly impregnated with the vitriol of 
iron and allum, and containing fome calcarious earth, 
felenites and fait. 
It would be abfurd in me to trouble you, Sir, either 
with any more experiments, or the relation of the 
feveral cafes, in which I have found the falutary ef- 
fects of the Somerfham water, lince no one knows 
its properties better than you, Sir, nor directed it for- 
merly with greater efficacy. I fhall, therefore, now 
lay before you Dr. Morris’s letter, in confirmation of 
what I have faid, and only mention, that upon the 
feveral trials made with this water on human calculi, 
both at Huntingdon and in London by me, and lately 
by Dr. Morris, the Somerffiam water has a£ted power- 
fully on thofe fubftances that it mixes well with the 
blood, and pafifes vifibly with the urine. But thefe 
experiments, and the above-mentioned cafes, trite as 
they muff be to you, may probably, with other par- 
ticulars relating to the county of Huntingdon, be laid 
before the public at fome other time. 
I am happy in this opportunity of acknowleging 
myfelf, with the greateft regard. 
Dear Sir, 
Your mod obliged, 
and moft obedient humble fervant, 
D. P. LayarcL 
Lower Brook-ftrect, 
Nov. 15, 1765. 
Letter 
