An essay towards a history of the principal comets that have appeared since the year 1742 Including a particular Detail of the Return of the famous Comet of 1682 in 1759, according to the Calculation and Prediction of Dr. Halley. Compiled from the Observations of the most eminent Astronomers of this Century. With remarks and reflections upon the present comet. To which is prefixed, by way of introduction, a letter upon comets. Addressed to a lady, by the late M. de Maupertuis. Written in the year 1742