DURING the past ten or fifteen years a great deal of work has been done by mathematical teachers in wiping old scores off the slate and redeveloping their teaching on more sensible and rational lines. It is well known that this revolution owes its success largely to the indefatigable exertions of Prof. John Perry. We cordially agree with many of the remarks contained in the preface to the present book. It is impossible to quote the whole of the author's attacks on the old-fashioned drudgery in algebra which has disgusted many would-be mathematicians in the past, and made it quite impossible for the present reviewer ever to appreciate anything but applied mathematics. We can only quote the first few lines:— Elementary Practical Mathematics. With Numerous Exercises for the Use of Students, and especially of Mechanical and Electrical Engineering Students. By Prof. John Perry. Pp. xiv + 335. (London: Macmillan and Co., Ltd., 1913.) Price 6s.