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MATHEMATICAL. 

 BY G. B. AIRY, M.A., F.R.S., 



Astronomer Royal. 



Mathematical Tracts on the Lunar and Planetary 



Theories. The Figure of the Earth, Precession and Nutation, 

 the Calculus of Variations, and the Undulatory Theory of Optics. 

 Fourth Edition, revised and improved. 8vo. cloth, 15s, 



BY R. D. BEASLEY, M,A. 



Head Master of Grantham Grammar School. 



An Elementary Treatise on Plane Trigonometry; 



with a numerous Collection of Examples, chiefly designed for the 

 use of Schools and Beginners. Crown 8vo. cloth, 3s. 6c?. 



BY GEORGE BOOLE, D.C.L., 



Professor of Mathematics in Queen's University, Ireland. 



A Treatise on Differential Equations. Crown 8vo. cloth, 14*. 

 BY W. H. DREW, M.A., 



Second Master of Blackheath Proprietary School. 



A Geometrical Treatise on Conic Sections. With a 



Copious Collection of Examples, embodying every Question 

 which has been proposed in the Senate-House at Cambridge. 



Crown 8vo. cloth, 4s. 6d. 



BY HUGH GODFRAY, MA. 



Of St. John's College, Cambridge. 



Elementary Treatise on the Lunar Theory. Second 



Edition. Crown 8vo. cloth, 5*. 6d. 



BY A. R. GRANT, M.A., 



, H. M. Inspector of Schools. 



Plane Astronomy. Including Explanations of Celestial Phe- 

 nomena, and Descriptions of Astronomical Instruments. 8vo. 6*. 



