ADVICE to BEGINNERS.
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HE Perſpective of Structures here treated of, can have no Grace or Proportion, without the Help of Architecture. 'Tis therefore abſolutely neceſſary, that you employ yourſelf for ſome time in Drawing, and the Study of that Art; till you can readily deſcribe the Plan of any Upright, and from thence project the Section or Profile, as is ſhewn thro' the whole Courſe of this Work; and more particularly, in the Sixty-eighth and Seventieth Figures: Foraſmuch as the proper Depth of each Part of the Perſpective, is determined by the Plan and Profile thereof.
I ſhall add this one thing more, which is indeed of the laſt Importance; to wit, that you endeavour to underſtand the Second Figure thorowly; before you proceed to the Third; and ſo of the reſt: they being diſpos'd in ſuch Order, that the Knowledge of the preceding Figure is always neceſſary to a right Underſtanding of that which follows, if you meet with any thing which at firſt ſeems difficult in the Deſcription, a diligent Inſpection of the Figure may relieve you: And on the other hand, if you find not in the Figure every thing you deſire, you may have recourſe to the Explanation. What Errors you diſcover in the Work, I hope you'll generouſly overlook and pardon.
