MATHEMATICS. 11 



Parkinson (S.) continued. 



and Trigonometry. Several additional propositions have been in- 

 corporated in the work for the purpose of rendering it more complete, 

 and the collection of Examples and Problems has been largely in- 

 creased. 



A TREATISE ON OPTICS. Third Edition, revised and en- 

 larged. Crown 8vo. cloth. los. 6d. 



A collection of Examples and Problems has been appended to this work, 

 which are sufficiently numerous and varied in character to afford 

 useful exercise for the student. For the greater part of them, re- 

 course has been had to the Examination Papers set in the University 

 and the several Colleges during the last twenty years. 



Phear. ELEMENTARY HYDROSTATICS, with Numerous 



Examples. By J. B. PHEAR, M.A., Fellow and late Assistant 

 Tutor of Clare College, Cambridge. Fourth Edition. Crown 8vo. 

 cloth. 5.5-. 6d. 



This edition has been carefully revised throughout, and many new 

 Illustrations and Examples added, which it is hoped will increase 

 its usefulness to students at the Universities and in Schools. In ac- 

 cordance with suggestions from many engaged in tuition, answers to 

 all the Examples have been given at the end of the book. 



Pratt. A TREATISE ON ATTRACTIONS, LAPLACE'S 

 FUNCTIONS, AND THE FIGURE OF THE EARTH. 

 By JOHN H. PRATT, M.A., Archdeacon of Calcutta, Author of 

 "The Mathematical Principles of Mechanical Philosophy. " Fourth 

 Edition. Crown 8vo. cloth. 6s. 6d. 



The author's chief design in this treatise is to give an answer to the 

 question, "Has the Earth acquired its present form from being 

 originally in a fluid state?" This edition is a complete revision of 

 the former ones. 



Puckle. AN ELEMENTARY TREATISE ON CONIC SEC- 

 TIONS AND ALGEBRAIC GEOMETRY. With numerous 

 Examples and Hints for their Solution ; especially designed for the 

 Use of Beginners. By G. H. PUCKLE, M.A., Head Master of 



