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Mr. Weaver on the 
seminated. This vein is very regular in its range and dip, but less 
certain in its produce, the ore of which yields 70 per cent, of 
metal. 
To the westward of Luganure vein is another vein in the granite, 
at the distance of a few fathoms, appearing in the brook. It dips 
also toward the west, ranging 35° east of north and west of south, 
and hence it probably converges with Luganure vein toward the 
north. It is three feet wide, consisting of quartz which contains 
lumps and disseminated portions of galena, and also of white and 
green lead ores. 
§ 95. Glendalough vein ranges east and west, crossing the glen in 
an oblique direction; (§19. 29.) Its course may be pursued with the 
eye down the precipitous southern brow of Comaderry for a consider- 
able distance, its southern side being denuded in several places, and 
standing like an erect wall, twenty to thirty feet high. In its range 
across the glen, it is lost beneath the mass of debris accumulated in 
that quarter, but it re-appears high up on the other side, to the 
south of the waterfall. The line in which it may be traced is 
about half a mile; but to the west it probably ranges far up into 
the granite of the interior; while to the eastward it does not seem 
to extend much into the mica slate, not appearing, as might other- 
wise be expected, in the precipices on the Glenasane side. By 
various trials in different parts of its course, I have ascertained this 
vein to be from five to seven fathoms in width, with a smooth 
parting or sticking on the south side. The great mass is quartz, 
varying from a very coarse to the most crystalline structure; some- 
times exhibiting a congeries of balls or spherical concretions, com- 
posed of columnar concretions converging to a common centre. 
These balls I have also found in the centre of a mass of galena; 
and similar appearances may likewise be remarked in the vein at 
