350 Summary Revieia of the late Investigations 



water, accumulated, without doubt, partly from above; by 

 Avhich means the temperature, not only of the water but 

 also of the air, in these mines, must have been affected. In 

 the United Mmes also, there was some water when the obsei- 

 vations were made ; but it remained too short a time, I ap- 

 prehend, materially to affect the general temperature of the 

 mine. Dolcoath and Huel Abraham were clear of water to 

 the bottom ; and it will be observed that the temperature in 

 the corresponding levels of these mines differed very little, and, 

 with a few trifling exceptions (which probably arose from local 

 causes), the heat progressively increased, even to the greatest 

 depths to which they have been hitherto explored." 



Mr. Fox also gives, in this paper, from the Cornwall Ga- 

 zette, the results of some observations on the temperatures of 

 the collieries in the north of England ; but as we shall append 

 to the present article an abstract of the paper by Mr. Bald, 

 in which those results were primarily recorded, it is unneces- 

 sary to cite them in this place. 



II. The Table which accompanies Mr. Fox's second paper 

 (Trans. G. S. C. vol. ii. p. 19) " contains a general view of the 

 heat observed in or near the metallic veins, in different mines." 

 It is as follows: 



N. B. The capital letters denote the rocks which inclose the veins: viz. 

 G. Granite, S. Schistus, P. Porphjxy. The small letters a. e. w. show lliat 

 the temperature is that of the air, earth, or water. 



* Here there wai a strong current of aii\ 



