16 SCIENTIFIC CATALOGUE. 



Todhunter (I.)— continued. 



A TREATISE ON SPHERICAL TRIGONOMETRY. Third 

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



The present work is constructed on the same plan as the treatise on 

 Plane Trigonometry, to which it is intended as a sequel. In the 

 account of Napier's /tnles of circular parts, an explanation has 

 been given of a method of proof devised by Napier, which seems to 

 have been overlooked by most modern writers on the subject. Con- 

 siderable labour has been bestowed on the text in order to render it 

 comprehensive and accurate, and the Examples (selected chiefly 

 from College Examination Papers) have all been carefully verified. 

 "For educational purposes this work seems to be superior to any 

 others on the subject.' 1 '' — Critic. 



PLANE CO-ORDINATE GEOMETRY, as applied to the Straight 

 Line and the Conic Sections. With numerous Examples. Fourth 

 Edition, revised and enlarged. Crown 8vo. cloth. 7^. 6d. 



The author has here endeavoured to exhibit the subject in a simple 

 manner for the benefit of beginners, and at the same time to include 

 in one volume all that students usually require. In addition, 

 therefore, to the propositions 'which have always appeared In such 

 treatises, he has introduced the methods of abridged notation, 

 which are of more recent origin : these methods, which are of a 

 less elementary character than the rest of the work, are placed in 

 separate chapters, and may be omitted by the student at first. 



A TREATISE ON THE DIFFERENTIAL CALCULUS. 



With numerous Examples. Fifth Edition. Crown Svo. cloth. 

 1 os. 6d. 



The author has endeavoured in the present work to exhibit a compre- 

 hensive view of the Differential Calculus on the method of limits. 

 In the more elementary portions he has entered into considerable 

 detail in the explanations, with the hope that a reader who is without 

 the assistance of a tutor may be enabled to acquire a competent ac- 

 quaintance 'with the subject. The method adopted is that of Dif- 

 ferential Coefficients. To the different chapters are appended 

 Examples sufficiently numerous to render another book unnecessary : 

 these Examples being mostly selected from College Examination 

 Papers. This and the follozcing work have been translated into 



