1 6 EDUCATIONAL BOOKS. 



Childe. THE SINGULAR PROPERTIES OF THE ELLIP- 

 SOID AND ASSOCIATED SURFACES OF THE NTH 

 DEGREE. By the Rev. G. F. CHILDE, M.A., Author of 

 " Ray Surfaces," " Related Caustics," &c. 8vo. 10*. 6d. 



The object of this volume is to develop peculiarities in the Ellipsoid ; 

 and, further, to establish analogous properties in the unlimited congeneric 

 series of which this remarkable surface is a constituent. 



Christie. A COLLECTION OF ELEMENTARY TEST- 

 QUESTIONS IN PURE AND MIXED MATHEMATICS ; 

 with Answers and Appendices on Synthetic Division, and on the 

 Solution of Numerical Equations by Homer's Method. By JAMES 

 R. CHRISTIE, F.R.S., late First Mathematical Master at the 

 Royal Military Academy, Woolwich. Crown 8vo. cloth. Ss. 6d. 



The series of Mathematical exercises here offered to the public is collected 

 from those which the author has, from time to time, proposed for solution 

 by his pupils during a long career at the Royal Military Academy. A 

 student who finds that he is able to solve the larger portion of these exercises, 

 may consider that he is thoroughly well grounded in the elementary prin- 

 ciples of pure and mixed Mathematics. 



Dalton. ARITHMETICAL EXAMPLES. Progressively 

 arranged, with Exercises and Examination Papers. By the Rev 

 T. DALTON, M.A., Assistant Master of Eton College. i8mo 

 cloth. 2s. 6d. 

 Answers to the Examples are appended. 



Day. PROPERTIES OF CONIC SECTIONS PROVED 

 GEOMETRICALLY. PART L, THE ELLIPSE, with 

 Problems. By the Rev. H. G. DAY, M.A., Head Master of 

 Sedburgh Grammar School. Crown 8vo. $s. 6d. 

 The object of this book is the introduction of a treatment of Conic 

 Sections which should be simple and natural, and lead by an easy transi- 

 tion to the analytical methods, without departing from the strict geometry 

 of Euclid. 



