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 ADVICE to BEGINNERS.

HE Perpective of Structures here treated of, can have no Grace or Proportion, without the Help of Architecture. 'Tis therefore abolutely neceary, that you employ yourelf for ome time in Drawing, and the Study of that Art; till you can readily decribe the Plan of any Upright, and from thence project the Section or Profile, as is hewn thro' the whole Coure of this Work; and more particularly, in the Sixty-eighth and Seventieth Figures: Foramuch as the proper Depth of each Part of the Perpective, is determined by the Plan and Profile thereof.

I hall add this one thing more, which is indeed of the lat Importance; to wit, that you endeavour to undertand the Second Figure thorowly; before you proceed to the Third; and o of the ret: they being dipos'd in uch Order, that the Knowledge of the preceding Figure is always neceary to a right Undertanding of that which follows, if you meet with any thing which at firt eems difficult in the Decription, a diligent Inpection of the Figure may relieve you: And on the other hand, if you find not in the Figure every thing you deire, you may have recoure to the Explanation. What Errors you dicover in the Work, I hope you'll generouly overlook and pardon.