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FORE:Halley's quadrant was constructed and made known by him to the Philosophical Society, in 1731, though Thomas Godfrey, a glazier, of Philadelphia, is said to have made a similar instrument a year before. As early, however, as 1727 Newton had described such an instrument to Halley, that is, a very little time before his death. This invaluable instrument has since been improved, first into a sextant, and ultimately into a complete circle. In 1758 appeared John Dollond's corrections of Newton's views of the dispersion of refracted light, and in the following year his achromatic telescope, based on his accurate discoveries.The fascination exercised by Plotinus was not only intellectual, but personal. Singularly affable, obliging, and patient, he was always ready to answer the questions of his friends, even laying aside his work in order to discuss the difficulties which they brought to him for solution. His lectures were given in Greek; and although this always remained to him a foreign language, the pronunciation and grammar of which he never completely mastered, his expressions frequently won admiration by their felicity and force; and the effect of his eloquence was still further heightened by the glowing enthusiasm which irradiated his whole countenance, naturally a very pleasing one, during the delivery of the more impressive passages.410

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