The reason why the British Association selected a site here and erected this earthquake-house at Comrie, was on account of the long-continued periodical shocks that had been felt in Upper Strathearn, particularly from the year 1780 to 1848. About the former date, they had been rather severely felt over the whole district, and damage to some extent done to buildings. On a sheet of water near to Lawers House, the ice was shattered to pieces. Some of the inhabitants at that time kept a record of their occurrence; and we believe the late Sir David Dundas, of Dunira, had a seismometer placed on his estate in Glenlednoch, to the north of Comrie; but there seems to be no evidence to show that it had ever indicated any shock. Coming down to the year 1839, the inhabitants of the village of Comrie were greatly alarmed, about eleven o’clock on the night of the 23d of October, by one of the most violent tremors that had been experienced there; and the good people rushed out of their houses and assembled in the old Secession Church for prayer, which was conducted by the Rev. R. T. Walker, the minister of that church. Many others fled to the hills. But no serious damage was done to property, save some rents in the chimneys. From 1839 to 1847, tremors continued to be more frequent, causing considerable alarm by the movements of furniture and crockery. The work of erecting the building proposed by the British Association was carried out under the care of the late Dr James Bryce of Glasgow, who resided here for many seasons, and was well acquainted with the locality and its geological formation. The site chosen is a rising ground near Drumearn House, and is built on rock that is supposed to extend a considerable distance westward. The building is stone, and slated, and is about seven feet square inside. The floor is laid with Arbroath pavement, on solid rock, and is overlaid with fine sand, on which are placed two boards, at right angles to each other. These boards are six feet long by nine inches broad, and on each are placed, standing, nine round wooden pins, varying from the fourth of an inch to an inch and a half in diameter, but all of one height (eight inches). The building is in excellent condition, and the pins or markers are in their places, awaiting the action of an earthquake to record the desired information as to the severity and direction of this now seemingly extinct agency of force in Upper Strathearn. The size of pin or cylinder thrown down, and the direction in which it falls, indicate the strength of shock as well as its direction. Any one who feels interested and may wish to visit the building will readily get access by applying to Mr Drummond.