458 Proceedings of Philosophical Socieiies. [Dec, 



ing happened to a steam-engine in the United-Mines Mine, the 

 water increased in the bottom of the mine at the depth of 200' 

 fathoms, so as to fill the two lowest galleries, and continued two 

 days. Immediately after this water had been pumped out, and 

 before the men returned to work, the temperature of these galle- 

 ries was 87i° and 88°, and this rather diminished than increased 

 for some days after the miners returned to their labour there. 

 Will this facL afford any additional clue to the explanation of the 

 temperature of mines i 



S. Two papers, by Mr. John Hawkins, were then read: One 

 was on the Alternation of primitive Strata in Cornwall ; the other, 

 on the Intersection of Lodes, and the Inferences to be deduced 

 therefrom. Both these are unsusceptible of abridgment. 



4. Two papers were read, by Mr. Joseph Carne, one on some 

 singular Lead Veins lately discovered in Cornwall ; the other, 

 on Cornish Petroleum. The former paper referred principally to 

 the very productive mine of Sir Christopher Hawkins in the 

 parish of Newlyn, which is said to yield more than 1000/. 

 monthly in silver alone. Naptha nor maltha has never beerr 

 found in Cornwall. Petroleum has been found in the copper 

 mine of Wheal Unity, at a considerable depth, contained in 

 small cavities in quartz. 



Short notices were also read, by Mr. Carne, on the Mode of 

 Blasting Rocks, and on the Account of Tin and Copper pro- 

 duced in Great Britain and Ireland during last year. 



5. A paper, by Mr. Boase, Treasurer of the Society, on the 

 Cultivation of Geological Science in Cornwall, pointed out the 

 difficulties thrown in the way of the cultivation of geology in 

 the commencement of the study, and explaining away all the 

 objections that have been made to its cultivation by well-design- 

 ing but ignorant persons, the author proceeded to detail the vast 

 importance of the science geiieraUi/, and especialli/ to Cormcall, 

 which, while it can derive more benefit from the study than any" 

 other country, offers greater facilities to the student ^hnn any 

 other spot of equal extent on the surface of the globe. The 

 writer proceeded to demonstrate how very nearly the inhabi- 

 tants of Cornwall, and especially the proprietors of land, are 

 interested in the prosecution of the study of geology ; and, oa 

 these grounds, he demanded of them, as their own peculiar 

 affair, to continue to this Society, and every other having similar 

 objects, that patronage and protection which they have so libe- 

 rally extended hitherto ; and he appealed to those Cornishmen 

 who were distinguished for their learning and science (and there 

 are many such) to consecrate some portion of their immortal 

 labours to the welfare and renown of their native county. The 

 discourse thus concluded : " Stimulated by motives so powerful 



^s the fair fame of our country, the diffusion of useful knowledge, 

 and the increasing prosperity of the community at large, much 

 may be expected, and we should not forget that much is 



