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On GRANITE. ~- 79 
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_ the Alpine ftrata ; that is to fay, I wanted to fee, whether the 
granite mafs, in point of time, had been prior or pofterior to 
thefe water-formed bodies ; and, as to the manner of operation, 
’ I particularly defired to know, if that granite had been made to 
flow, in the ftate of fufion, among the broken: and diflocated 
ftrata. 
Havine thus fufpended my opinion, until I fhould have an 
opportunity of finding fome decifive appearance, by which 
this important queftion might be determined with certainty, I 
confidered where it might be moft likely to find the junétion of 
the granite country with the Alpine ftrata. Mr CLerx of Eldin 
and I had an engagement to vifit the Duke of ATHOL, at Blair. 
-I concluded, that from Blair it could not be far before the great 
mafs of granite, which runs fouth-weft from Aberdeen, would 
be met with, in afcending the river Tilt, or fome of its branches. 
Mr Crerk and I were, however, refolved to find it out, to what- 
ever diftance the purfuit might lead us among the mountains of 
this elevated track. Little did we imagine that we fhould be 
fo fortunate as to meet with the objeé of our fearch almoft upon 
the very fpot where the Duke’s hunting-feat is fituate, and where 
we were entertained with the utmoft hofpitality and ele- 
gance. 
_ Ir is in Glen Tilt, and precifely in the bed of the river, that 
this junction is formed of the granite with the Alpine ftrata. 
But this circumftance, of being in the bed of the river, where 
the rocks are often wafhed bare, is of fuch importance, that 
had this junction been only to be found in the mountains co- 
~ vered with heath and mofs, we might have been upon the {pot, 
and yet been ignorant of the moft material circumftances of the 
fact, which we wanted to explore. 
I eRe had every fatisfaGtion that it was poffible to defire, 
having found the moft perfect evidence, that the granite had been 
made to break the Alpine ftrata, and invade that country in a 
fluid ftate. This correfponded perfeétly with the conclufion 
which 
