| £. | s. | d. | |
| Annual value of the Real Property, as returned to Parliament in 1815 | 3989 | 0 | 0 |
| Poor Rate in 1831 | 577 | 17 | 0 |
| Population,— | |||
| in 1801, 954 | in 1811, 1161 | in 1821, 1425 | in 1831, 1630 |
giving an increase of 71 per cent. in 30 years.
Present Rector, the Rev. Charles Lyne, presented by the Trustees in 1833.
THE GEOLOGY, BY DR. BOASE.
The grand geological feature of this interesting parish is the large mass of granular shorl rock, which towers above the adjacent country. It has all the appearance and form (so far as regards the mechanical structure of this mass) of a projecting tor of granite, such as commonly cap the most elevated hills in Cornwall: but a nearer examination shows that it is a compound of shorl and quartz. This rock is entirely surrounded by a felspathic slate, being about a mile distant from the granite. St. Mewan Beacon is an instance of another large tor of shorl rock, a notice of which was omitted under the head of St. Mewan; this rock differs however from that of Roach in having a base of compact crystalline quartz, throughout which the shorl is disseminated in various proportions. Its position is also different, for that rises immediately out of the granite.
The southern part of Roach parish reposes on granite;
the remainder on rocks of the porphyritic series. It corresponds in its geological structure with the parish of St. Dennis.