PREFACE.
The present work is intended as a sequel to our Elementary Algebra for Schools. The first few chapters are devoted to
a fuller discussion of Ratio, Proportion, Variation, and the
Progressions, which in the former work were treated in an
elementary manner; and we have here introduced theorems
and examples which are unsuitable for a first course of
reading.
From this point the work covers ground for the most part new to the student, and enters upon subjects of special importance: these we have endeavoured to treat minutely and thoroughly, discussing both bookwork and examples with that fulness which we have always found necessary in our experience as teachers.
It has been our aim to discuss all the essential parts as completely as possible within the limits of a single volume, but in a few of the later chapters it has been impossible to find room for more than an introductory sketch; in all such cases our object has been to map out a suitable first course of reading, referring the student to special treatises for fuller information.
In the chapter on Permutations and Combinations we are much indebted to the Rev. W. A. Whitworth for permission to make use of some of the proofs given in his Choice and Chance. For many years we have used these proofs in our own teaching, and we are convinced that this
