t 53 ] 
V. Some Obfervations on the Heat of Wells and Springs in the 
Jjland oj Jamaica, and on the Temperature of the Rarth 
below the Surface in different Climates . By John Hunter, 
M. D. F . R. S . ; communicated by the Hon . Henry Cavendifh, 
^HE following obfervations on the heat of fprings and 
wells, and their application towards determining the 
mean temperature of the earth in different climates, were fug- 
gefled by you in fome converfation on that fubjett, previous 
to my going to Jamaica in 1780. If you think them deferving 
the attention of the Royal Society, I muff beg the favour of 
you to lay them before that learned Body. 
F. R. S. 
Read December 20, 1787 
TO THE HON. MR. CAVENDISH. 
S I R, 
I have the honour to be, &c. 
JOHN HUNTER 
Charles-ftreet,. 
Dec.. 11, 1787. 
THE. 
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