An appendix to the English translation of Commandine's Euclid wherein the eleventh and twelfth books of the Elements are made easy to the meanest capacity, by exhibiting the solids themselves to the eye, instead of their several pictures or projections laid down by the several writers of elements of geometry. A tract useful and necessary for painters, builders, gardeners, and all persons who would inform themselves demonstratively in perspective, mensuration, sphericks, &c. or qualify themselves to read the works of those who have written farther on solid geometry. With an introduction, explaining the projection used by the ancients, and shewing its excellency to any other for this purpose