the projections of the sphere, many of which are extant, by authors so well known to the public, as to render the mention of their names superfluous.
With respect to the tabular part, several new and useful arrangements will be found, most of which have an immediate and particular reference to the contents of the Work; a circumstance which will render this Treatise more complete than most others of the same price and dimensions.
Upon the whole, no exertions have been wanting to adapt this Work to the purposes of scholastic instruction and to private students, by the numerous and extensive variety of examples to each problem. And that this branch of education might be still more facilitated, and the difficulties and labour both to teachers and scholars in a great degree removed, an "EXAMPLE BOOK," adapted to the Work, by the same Author, is nearly ready for publication, in which