St. Michael’s Mount, adjoining the shore of this parish, is an object of great attention to the geologist as well as to the tourist. It is composed almost entirely of granite, having only two small patches of slate, one on the western and the other on the eastern side; at these two places, and more particularly at the latter, the junction of the granite and of the slate may be seen, the slate being intersected with numerous granite veins. The granite of the Mount is not so large-grained as that of the Land’s End; but the structure of the rock is no where better displayed than at this place on the southern side; where the whole mass is distinctly divided into large quadrangular blocks, and is traversed in a direction parallel to the divisions, by quartz veins, which contain crystals of mica, of apatite, and of topaz, and also the ores of tin, copper, and wolfram, the latter of which is the most abundant. One most important geological fact is here beautifully exhibited. That the mineral composition of granite is altered in the vicinity of quartz veins, whether they are metalliferous or otherwise; approaching these veins the granite becomes more and more siliceous, until at length it gradually passes into the quartz, which forms the body (or matrix as it is called) of the veins. A fact difficult to reconcile with the generally received opinion, which assumes all veins to have been originally fissures, subsequently filled up from above or beneath. [6] William of Worcester. HILL, NORTH. HALS. Is situate in the hundred of East, and hath upon the north Lewanack, east Lezant, south and west Linkynhorne. Under what district this parish was taxed in Domesday Roll I know not; however, in the Inquisition of the Bishops of Lincoln and Winchester, into the value of Cornish Benefices, 1294, “Ecclesia de Northill in decanatu de Estwellshire” was taxed £6; in Wolsey’s Inquisition, 1521, £36. 6_s._ 8_d._ The patronage is in Darley; the incumbent Darley. The parish is rated to the 4_s._ per pound Land Tax, 1696, £211. 12_s._ Trebatha, in this parish, which after the English-Cornish may be interpreted a town of baths, or washing fountains, otherwise the town of clubs or bats, is the dwelling of an old family of gentlemen surnamed Spour. The present possessor Henry Spour, Gent. that married Rhodes, and giveth for his arms, Gules, on a chevron Or, a rose of the first between two mullets or spur rowells Sable pierced. Now Charles Grylls, Esq. married the daughter and heir of Spour, relict of Bellot, of Bochin. She surviving her husband, without issue, as I am informed, is married to her cousin Rodd, and to him and his heirs hath conveyed all her lands.