150 Mr. Weaver on the 
mine, it has afforded another opportunity of examining the re- 
peated alternations of granite and mica slate. If we enter this level, 
we find, measuring on the line of the adit, 
1. 
At its mouth, mica slate 
. 1 fathom thick 
2. 
Granite .... 
. 3 fathoms 2 feet 
3 . 
Mica slate 
. 29 
1 — 
4. 
Granite .... 
. 11 
0 — 
5. 
Mica slate 
4 
5 — 
6. 
Granite .... 
3 
5 — 
7. 
Mica slate 
. 10 
1 — 
8. 
Granite .... 
. 3 
3 — 
9. 
Mica slate 
6 
4 — 
10. 
Granite, to the vein, 
. 67 
3 — 
This last bed occupies the lower part of the mine, but is the 
uppermost of the series above mentioned. It is surmounted by a 
thick bed of mica slate, above which are repeated alternations of 
these two rocks, as proved by the underground operations, but 
which, from the circumstances of the mine, do not admit of accu- 
rate admeasurement. 
All these beds range uniformly 40° east of north and west of 
south, and dip at an angle of 20° toward the south-east ; and the 
direction of the adit being 12° north of east and south of west, 
they are perforated under an angle of 38°. The vein itself inter- 
sects these beds in the direction of 25° west of north and east of 
south, forming an angle of 65° with the line of their direction, and 
of 77° with that of the adit. The ravine upon Lugduff, up which 
l have just supposed the reader to be conducted, is situated about 
130 fathoms from the adit and higher up the glen. Hence, com- 
bining the relative position of the parts, it is obvious that many of 
the lower beds in the ravine cannot appear in the line of the adit, 
nor can several of the upper beds appear in the right wing of the 
