Such a work as this is not to be wholly executed in the closet or study. Great part of its materials are to be sought for in the field ; and every place visited, to make proper inquiry into its antiquities, and its civil and natural history, which last consists of very different branches of science. The topography of each place must be noted; its bearing, distance, latitude and longitude observed, with all the correctness and assistances astronomy, and practical trigonometry, afford.
