404 Messrs. W. Phillips and S. Woods on the [Dec. 
are assumed to be chlorite, and this continued with little varia- 
tion until we had advanced much higher, when suddenly a 
sort of puddingstone appeared, of which the paste or basis 
was the same rock, and the included masses nearly in sphe- 
rical nodules of a substance sometimes resembling hornstone, 
but mostly weathering either into hollow or concentric balls, 
apparently. of whitish hornstone. A solid unweathered mass 
broken through the centre exhibits the appearance of its being 
formed of concentric coats, somewhat varying in colour from 
white to yellow; this mass does not yield to the knife.. This 
rock prevailed for a considerable distance E and W, and about 
12to 20 feet in width, the fore mentioned rock ranging on each 
side of it. Suddenly it assumed a somewhat different appear- 
ance, as though it had become cellular, by the disintegration of 
the rock having left only the apparent hornstone, which, there- 
fore, must have been disseminated through the mass. On this 
rock, we met with a range of shallow quarries, from which the 
vesicular stone was raised, as we have since heard, on the 
assumption that it might be employed for millstones in place of 
the French buhrstone; but the scheme was relinquished on 
finding that the decomposition which had produced its cavities 
had not proceeded far into the mass, which became softer in 
descending. About one quarter of a mile from these quarries, 
and at the edge of the cliff, there is a large and very singular 
mass projecting towards the sea, possessing all the external 
appearance of the same rock. Just beyond this, the rock first 
observed appeared to be traversed by veins, and to include 
specks and small masses of white quartz, which sometimes pre- 
vailed so greatly as to constitute a very hard rock; but m many 
instances, the quartz was left by the decomposition of the rock 
in a vesicular state, the cavities being lined with crystals of 
quartz, as well as all the crevices in the rock itself, the surface 
of the hill being strewed over for some distance with small masses 
or fragments of this description ; and, finally, at about the place 
at which we descended, quartz appeared to be so finely and 
universally disseminated throughout the mass as to give an 
increased hardness to the rock, and somewhat the aspect of 
compact felspar, occasionally of hornstone, or of a fine-grained 
sandstone, and these we assume to be the varieties alluded to by 
the Rev. W. D. Conybeare as the felspathic rock of this hill. 
The fragments scattered on the side of the remaining descent 
(about one-fourth of a mile), denoted the continuance of the 
same rock to the termination of the hill. On the side towards 
the high road, we saw the workings ofa mine for lead, but none, 
as we were informed, had yet been discovered. Opposite to this 
felspathic-looking rock, namely, on the other side of the high 
road, coarse slates prevailed, interstratified with a still harder 
variety of rock first observed in ascending Conway Hill, but 
2 
