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fore, as a grateful Acknowledgment of the many Favours received, I humbly beg leave to Dedicate this Piece to you; and am with the greatest Regard
; H E R E are so many Books of Navi§§g gation already extant, that it may seem .3 impertinent to trouble the World with a so new One; especially since some good Ma#ho thematicians both at home and abroad, -- * and many who were perfeit Masters of the Prattice, have written on this Subjeśī. The former of these being fond of ingenious Speculations, have generally been too prolix on the Theory, and too short on the praffical Part. Whereas the later have in a great MeaJure negletted the Theory, and not being very solicitous about Language or Method, have delivered the praślical Rules in such a Manner, as they cannot be easily comprehended, and much less remembred, especially since there is seldom mention made of the Reasons on which they deend. p But I am very far from finding fault with all the Books on this Subječi; for there are some very full both on Theory and Pračice, against which, I have no other Obještion but that they are too tedions to be taught, and too dear to be purchased by moff People.
2%uth ought to learn the Elements from shorter Trea-