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A TREATISE of the Nature and Arithmetic of
LOGARITHMS; Likewise

Another of the ELEMENTS of Plane and Spherical
TRIGONOMETRY; With

A PREFACE, fhewing the Ufefulness and Excel-
lency of this WORK.

By Doctor JOHN KEILL, F. R. S. and late
Profeffor of ASTRONOMY in Oxford.

The Whole Revifed; where deficient, Supplied; where
loft, or corrupted, Reftored. Also,

ManyFaults committed by Dr.HARRIS, Mr.CASWELL,
Mr. HEYNE s, and other TRIGONOMETRICAL
WRITERS, are shewn, and in those Cafes where
They are mistaken, here are given Solutions Geome-
trically True.

An ample Account of which may be seen in the PREFACE

By SAMUEL CUNN.

The TWELFTH

EDITION,

Carefully Revised and Corrected.

To which is fubjoined an APPENDIX, containing the
Investigation of thofe Series omitted by the AUTHOR;
and the Difference between Dr. KEILL and Mr. CUNN
impartially examined and adjusted.

LONDON:

Printed for W. STRAHAN, JF. and

RIVINGTON,

T. LONGMAN, B. LAW, T. CADELL, E. JOHNSTON,
G. ROBINSON, and R. BALDWIN.

MDCC LXXXII.

xx

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