[ 10 ] 
Received December 3, 1765. 
III. A Letter to William Heberden, M. D> 
Fellow of the Royal College of Phyficians in 
London, and of the Royal Society , from 
Daniel Peter Layard, M. D. Phyfcian to 
her Royal Highnefs the Princejs Dowager 
of W ales, Member of the Royal College of 
Phyfcians in London, and of the Roy ah 
Societies ^London and Gottingen; giv'mg 
ait Account of the Somerfham Water , in 
the County of Huntingdon ; and tr anf nut- 
ting a Letter from Michael Morris, M. D. 
F. R. S. Member of the Royal College of 
Phyfcians in London, and Phyfcian to the 
Weftminfter Hofpital , to Dr. Layard, on the 
fame SubjeSi . 
Dear Sir, 
R?ad Feb. 6 > A T Iaft I venture to lay before you the 
1 7 66 * refult of thofe experiments and ob- 
lervations, which I have made on the Somerfham 
water. They were undertaken with your approba- 
tion, and purfued through your encouragement. 
To aicertain the contents of a mineral water, re- 
quires a repetition of the analyfis ; and notwithftand- 
ing the experiments have been repeated thefe four- 
teen years laft part, either at the fpring, at Ilunting- 
4 d° n > 
