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It is the object of this book to make some way in overcoming the difficulties of Geometrical conception, before the mind is called to the attack of ''Geometrical theorems. A few simple methods of construction are given;'' and space is left on each page, in order that the learner may draw in the figures.

This book contains a number of problems, chiefly elementary, in the ''Mathematical subjects usually read at Cambridge. They have been'' ''selected from the papers set during late years at Jesus College. Very few'' of them are to be met with in other collections, and by far the larger number are due to some of the most distinguished Mathematicians in the University.

It is a sufficient guarantee of the excellence of this complete edition of Newton's Principia that it has been printed for and under the care of Pro&shy;fessor Sir William Thomson and Professor Blackburn, of Glasgow Uni&shy;versity. The following notice is prefixed: — “Finding that all the editions of the Principia are now out of print, we have been induced to reprint Newton's last edition [of 1726] without note or comment, only introducing the ‘Corrigenda’ of the old copy and correcting typographical errors.” The book is of a handsome size, with large type, fine thick paper, and cleanly cut figures, and is the only modern edition containing the whole of Newton's ''great work. “Undoubtedly the finest edition of the text of the ‘Principia’'' which has hitherto appeared.” —.