In consequence of finding, on my recent return to England, that this work had been for some time out of print, and that considerable portions had been extracted by different authors, a second edition has been prepared, in which, beside many alterations, improvements, and omissions of parts since deemed not sufficiently practical, will be found a separate chapter devoted to Surveying in the Colonies, with reference to the marking out of waste lands for future occupation; the result of nearly ten years' experience obtained during the superintendence of the Survey of South Australia.