in the United Mines in Cornwall, 



26 



of its local or direct pressure ; for if some miles of distance 

 from the coasts did not render this highly improbable, the 

 considerable streams at very high temperatures, and very 

 constant too (as appears from observations made at different 

 times), are facts not consistent with such an explanation. 

 If the subterranean jets of water were caused by the inroads 

 of a neighbouring sea, we should expect to find them at com- 

 paratively low temperatures, and these diminishing in pro- 

 portion to the duration and amount of the influx. 



The salt may, however, have been derived from the ocean, 

 in consequence of the latter penetrating into the earth at its 

 greater depths, or even at its lesser ones, which, under dif- 

 ferent given circumstances, it may be supposed to do. In 

 either case, the salt water would, from its superior specific 

 gravity, have a tendency to descend through the heated and 

 less saline water in the veins, fissures, &c., where the fluids 

 becoming gradually more or less mixed and extended in dif- 

 ferent directions, might ultimately appear in some of our 

 mines, brought up, perhaps, in the largest proportions, by the 

 upward tendency of the more heated currents of water. 



Further Evidence of the Existence of Glaciers in Scotland in 

 Ancient Times. By Charles Maclaren, Esq., F.K.S.E. 

 Communicated by the Author. 



In October 1845, I published in the Scotsman an account of 

 certain phenomena at Gareloch, which seemed to me to prove 



