448 Mr. W, Phillips on Cleavelandite. [Dfic. 



of pump water at the adit (1822), in the eastern part of the mine, 

 72°; in the western ditto (much shallower) 64°. Has been 

 worked 20 years. 



Mean Results of the Temperature of Six Mines. 



B. 



Article XII. 



On the Occurrence of Cleavelandite in certain British Hocks, 

 By W. Phillips, FLS. MGS. &c. 



Some specimens of the rock of Mount Sorrel, in Leicester- 

 shire, lately brought from that place by my friend S. L. Kent, 

 MGS. and myself, appear to be chiefly constituted of two varie- 

 ties of felspar, common, and glassy. A tljird variety in other 

 specimens is reddish or red, sometimes extremely red, and 

 nearly opaque. These appeared to us to be only varieties of the 

 same mineral, and believing that mineral to be felspar, we should 

 so have designated the whole in a communication which we 

 purpose shortly to send for insertion in the Annals, on the rocks 

 in question, and on those of Charnwood Forest, but for the 

 remarks of M. Levy in the number for November, showing that 

 much which had been considered as felspar is in fact cleave- 

 landite. 



* Here there was a strong cunent of air. 



