484 
Mr, He ns low’s Supplementary Observations to 
further than he supposed it to extend, even where he mentions 
having found it. This was near the Dun, or as the Manks 
pronounce it, the Dtooden, a small harbour about three miles to the 
north of Laxey. A stream discharges itself here, and at a short 
distance from its mouth receives two feeders from die north, the 
most easterly of which is again subdivided into two courses, and it 
was in the southern branch of this that Dr. Bcigcr perceived the 
decomposed portion of the granite he mentions. The different 
courses descend from a boggy land on the lull to the weft, and run 
across the high road, but the main stream on the south \i the only 
one of sufficient magnitude to require a bridge. Both branches of 
the northern feeder run over the granite as far down as their union, 
where it disappears. The southern branch, at one spot, runs 
through a vaulted excavation in its course below the road, where 
the rock is so soft as to admit of its being dug by the spade. If a 
westerly course be pursued up the hill from this spot, many places 
will be found where the bare rock is exposed for several yards 
Square, and more particularly on some eminences near the top, 
where the soil has been washed away, and which are situate above 
the bog before alluded to, near the source of a stream which crosses 
the road about half a mile to the north, at Ballallen. It may also 
be traced towards the east, up the How, and though no good section 
is afforded in this direction, yet the disposition of numerous large 
blocks, unmixed with those of any other rock, sufficiently point out 
its extent. 
This granite passes into gneiss, which is also in a state of 
decomposition in the excavation above mentioned, though the 
small portion denuded precludes the possibility of ascertaining its 
connexion with the granite, and confines the description to 
a bare exposition of the fact of its existence. 
