Mr. Ernest Wood is well known as both a writer and a lecturer on religious and educational matters, and his work is always careful and thoughtful. A practical course on Concentration is a subject for which he is well equipped, and this little work should prove very useful to the serious student. It is admirably planned, and effectively carried and, out a most important fact in such treatise a there is nothing in it which, when practised, can do the striver after concentration the least physical, mental or moral harm. I can therefore heartily recommend it to all who desire to obtain control of the mind.