“St. Michael’s Mount in Cornwall, he says, “is an island at very high water, and, with rare exceptions, a peninsula at very low water. The distance from Marazion Cliff, the nearest point of the mainland, to spring-tide high-water mark on its own strand, is about 1680 feet. The total isthmus consists of the outcrop of highly inclined Devonian slate and associated rocks, and in most cases is covered with a thin layer of gravel or sand. At spring-tides, in still weather, it is at high-water about twelve feet below, and at low-water six feet above, the sea level. In fine weather it is dry from four to five hours every tide; but occasionally, during very stormy weather and neap tides, it is impossible to cross from the mainland for two or three days together.” “The Mount is an outlier of granite, measuring at its base about five furlongs in circumference, and rising to the height of one hundred and ninety-five feet above mean tide. At high-water it plunges abruptly into the sea, except on the north or landward side, where the granite comes into contact with slate. Here there is a small plain occupied by a village.... The country immediately behind or north of the town of Marazion consists of Devonian strata, traversed by traps and elvans, and attains a considerable elevation.” At the meeting of the British Association in 1865, Mr. Pengelly, in a paper on “The Insulation of St. Michael’s Mount in Cornwall,” maintained that the change which converted that Mount from a promontory into an island must have taken place, not only within the human period, but since Cornwall was occupied by a people speaking the Cornish language. As a proof of this somewhat startling assertion, he adduced the ancient British name of St. Michael’s Mount, signifying _the Hoar rock in the wood_. Nobody would think of applying such a name to the Mount in its present state; and as we know that during the last two thousand years the Mount has been, as it is now, an island at high, and a promontory at low tide, it would indeed seem to follow that its name must have been framed before the destruction of the ancient forest by which it was once surrounded, and before the separation of the Mount from the mainland. Sir Henry James, in a “Note on the Block of Tin dredged in Falmouth Harbor,” asserts, it is true, that there are trees growing on the Mount in sufficient numbers to have justified the ancient descriptive name of “the Hoar rock in the wood;” but though there are traces of trees visible on the engravings published a hundred years ago, in Dr. Borlase’s “Antiquities of Cornwall,” these are most likely due to artistic embellishment only. At present no writer will discover in St. Michael’s Mount what could fairly be called either trees or a wood, even in Cornwall.