could judge of the size of a room, and of his distance from the wall. And if he ever walked over a pavement in courts or piazzas which reflected sound, and was afterwards conducted thither again, he could tell in what part of the walk he had stood, merely by the note it sounded."
Another victim to small-pox during infancy was Dr Henry Moyes, a native of Fifeshire, born during the middle of the eighteenth century. "He was the first blind man who had proposed to lecture on chemistry, and as a lecturer he acquired great reputation; his address was easy and pleasing, his language correct, and he performed his experiments in a manner which always gave great pleasure to his auditors. . . . Being of a restless disposition, and fond of travelling, he, in 1785, visited America. . . . The following paragraph respecting him appeared in one of the American newspapers of that day:—'The celebrated Dr Moyes, though blind, delivered a lecture upon optics, in which he delineated the properties of light and shade, and also gave an astonishing illustration of the power of touch. A highly polished plate of steel was presented to him with the stroke of an etching tool so minutely engraved on it that it was invisible to the naked eye, and only discoverable by a powerful magnifying glass; with his fingers, however, he discovered the extent, and measured the length of the line. Dr Moyes informed us that being overturned in a stage-coach one dark rainy evening in England, and the carriage and four horses thrown into a ditch, the passengers and drivers, with two eyes apiece, were obliged to apply to him, who had no eyes, for assistance in extricating the horses. "As for me," said he, "I was quite at home in the dark ditch . . . now directing eight persons to pull
