Poldice was worked for tin about the commencement of the last century by Mr. Hearle, of Penryn. The mine happened to have very little water, and this was exhausted by rock and chain pumps moved by human labour. Copper seldom appears near the surface, as is the case with tin; but tin lodes out of granite frequently produce copper in depth. All the lodes in Gwenap have done so, and in some places the mines have gone to the depth of two hundred and thirty or forty fathoms from the surface, more than two hundred fathoms under the level of the sea, assisted by steam engines having working-cylinders ninety inches in diameter and ten feet long. The freehold of the land containing those mines is possessed in undivided shares between several persons; Mr. Hearle had one-third, that is now divided again into thirds between the descendants of three daughters, Mr. Tremayne, Mr. Rodd, and Mr. Stephens. The church in Gwenap is large in every dimension, but, what is very unusual, the tower stands apart. One of our late historians very justly complains of what he terms the “mangling of modern Vandalism,” in alterations of the church; Venetian frames have been substituted for stone mullions; windows of painted glass bearing the figures of saints have been removed; and the screen, or rood-loft, of beautiful workmanship has disappeared; modern deal seats have been introduced throughout the church, and a glare of light on the white-washed walls has completed the overthrow of very thing venerable. The interior is divided into a nave, a chancel, and two side ailes, supported on each side by seven handsome columns. The burial-ground contains a monument of fine marble in memory of the Beauchamps. There is a tradition in the parish of monks having been established in the church tower, and that a house now converted to an inn, was a part of the building. No notice whatever is taken of such a monastery in any authentic work. If therefore this tradition rests on any fact, the house cannot have been more than an hostelry for friars. The parish measures 5,289 statute acres. Annual value of the Real Property, as £. _s._ _d._ returned to Parliament in 1815 18,273 0 0 Poor Rate in 1831 3,329 9 0 Population, {in 1801, | in 1811, | in 1821, | in 1831, { 4594 | 5303 | 6294 | 8539 giving an increase of 86 per cent. in 30 years, and a numerical increase of three thousand nine hundred and forty-five persons. Present Vicar, the Rev. W. Marsh, presented by the Dean and Chapter of Exeter in 1825. GEOLOGY, BY DR. BOASE.