WEST DEVONSHIRE. 17 



of experiments ; whicli I profecuted with 

 greater folicitude, as I had been informed, 

 by an authority which T conceived to admit 

 not of doubt, that the Weftmorland Hate 

 contains a confiderable proportion of cal- 

 careous earth in its compofition, and I was 

 defirous to afcertain whether the Hate of 

 Devonfliire, whofe appearances are limilar, 

 were not hkewife fimilar in component 

 parts. 



All that requires to be faid, in this place, 

 refpcding thefe experiments, is, that the 

 Hate rock of Weft Devonfhire appears, 

 from their feveral refults, to be void of cal- 

 careous earth, in a ftate of gypfum, and that 

 the proportion it contains of this earth, in 

 a ftate of chalk, is very fmall. 



It may, however, be right to add here, 

 that, on extending the experiments to the 

 RUBBLE, and the chrystal, above- 

 mentioned, they appear to have been formed 

 from the fame materials with the rock 



Vol. L C itfelf. 



a quarry in its neighbourhood. They appear to be only 

 varieties of the fame fpecies of foflil ; and miglit, no doubt, 

 be traced, by conagdted gradations, into each other. 



