Lanivet measures 4690 statute acres.
| £. | s. | d. | |
| Annual value of the Real Property, as returned to Parliament in 1815 | 4086 | 0 | 0 |
| Poor Rate in 1831 | 375 | 12 | 0 |
| Population,— | |||
| in 1801, 513 | in 1811, 687 | in 1821, 803 | in 1831, 922 |
giving an increase of 80 per cent. in 30 years.
GEOLOGY, BY DR. BOASE.
The southern part of the parish reposes on granite; and proceeding northward, the next portion is composed of
rocks of the porphyritic series, which are again succeeded by those of the calcareous series. The middle portion is by far the most extensive, the other two occupying only a narrow part, on the extreme southern and northern parts of the parish. The middle, or porphyritic series, presents the most interesting phenomena.
Lanivet Hill is covered with large boulders and projecting torrs of massive rock, which have the appearance of granite; but on examination it proves to be a felspar rock. The greater part of this hill is composed of lamellar and slatey varieties of the same kind of rock, as may be seen in the rubbish of the numerous shafts that occur on the side of this hill. On the road to Bodmin, near the boundary of the parish, is a very interesting elvan course. The upper part of it is completely decomposed, resembling a mass of prepared China clay; the perfect rock is a greenish yellow compact felspar, with disseminated grains of quartz; it bears the same relation to the porcelainous granite of this and of the adjoining parishes, that the hard porphyritic elvans do to the common Cornish granite, near which they generally occur.