in certain Springs in Cornwall and Flintshire. 421 



Captain Francis also observes that the elevation of the 

 various mines above the sea is : Mold mines, 



South Mold 115 fathoms. 



Pant y buarth 105 — 



Milwr 80 — 



Talargoch 25 — 



Gwerny Mynydd 125 — 



Bagillt (coal measures) 2 — 

 The following Table is a ratio of comparison between the 

 months of maxima and minima of the intensity of the springs, 

 and of the quantity of rain. But I think much more ex- 

 tended observations requisite in order to put the subject be- 

 yond doubt. 



On another occasion, with your permission, I will endea-- 

 vour to make a comparison between these results and those 

 detailed in the papers already mentioned. 



Since I last had the honour of addressing you on the same 

 subject, I find that I was wrong in assuming that it had en- 

 gaged the attention of Mr. Bland and myself only; for I 

 find that measurements precisely similar to that gentleman'sf 

 and those of mine, were made in New South Wales by Sir 

 Thomas M. Brisbane, and that they have been published 

 by him J; and although their object does not appear to have 

 been exactly the same as ours, yet they lead towards the same 

 end. 



Permit me to express my most grateful thanks for your great 

 kindness to me on every occasion : and I have the honour 



to remain. 



Sir, yours, &c. 



Apartments of the Geological Society, 

 Penzance, July 20,1833. 



W. J. Henwood, 



* I interpolate, when there is an observation wanting, 

 f Phil. Mag. and Annals, N.S. vol. xi. p. 88. 

 I Brewster's Journal, vol. vi. p. 226. 



