Notwithstanding the supposed moisture of the Mount's Bay, the air is not less fit for respiration, nor less beneficial to the valetudinarian, than that of drier situations. The porous nature of the shelfy substratum soon disposes of any excess of water; so that, after a short cessation of rain, the invalid may safely venture abroad to enjoy the delightful walks which surround the bay; at the same time, the numerous promontories which distinguish this coast, promote a constant circulation of breezes around their extremities, so that mists seldom linger, and we never experience those sultry calms, or suffocating fogs, which not unfrequently infest other parts of our island. As Cornwall is directly exposed to the expanse of the Atlantic ocean, lying south-west of it, we cannot be surprised that the winds, which blow so generally from that quarter, should occasionally produce very violent storms. Their approach is frequently predicted by the experienced fisherman, from the agitation of the water along shore, a phenomenon which is called a "_ground swell_;" and which is probably occasioned by a storm in the Atlantic, with the wind west; in which case, as the storm proceeds eastward, the waves raised by it will outgo the wind, and reach the eastern coast long before it. A tremendous instance of this kind occurred, during the residence of the author of these pages, on the night of Sunday, January 19th, 1817. The storm assumed the character of a hurricane, and acting in conjunction with a spring tide, impelled the waves with such fury, that they actually broke over the mast heads of the vessels which were lying within Penzance harbour, and bore down every thing before them; two of the four pillars recently erected for the reception of a light were thrown down, and several of the foundation stones of the pier removed. The windows of the bath-house were demolished, and the whole of its furniture washed into the sea. The green between Penzance and Newlyn was torn up, and several boats, lying on the strand were actually carried into the neighbouring meadows. The towns of Newlyn and Mousehole suffered corresponding damage, and several of their houses were washed away. The road between Marazion and St. Michael's Mount was torn from its lowest foundation, and stones of more than a ton in weight, though clamped together with massy iron, were severed and removed from their situation. The turnpike road between Penzance and Marazion was, in many places, buried with sand; and in others, broken up by the violence of the waves, and covered by the sea to the depth of from three to five feet. Had the violence of the storm lasted but a few hours longer, who will venture to say that the two channels would not have been united by the inundation of the low land which constitutes the isthmus, and the district of the Land's end been converted into an island!