Intermediate Light

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    ENCOURAGED by the favour shown by advanced students to his “Treatise on Light,” Dr. Houstoun has now produced an elementary book on the same subject. It is broadly of University Intermediate or Higher Certificate standard, but the author, it is pleasant to note, is at no pains to conform to the syllabus of any particular examination. The book, therefore, contains matter seldom found in the ordinary elementary textbook, Colour and colour vision, for example, claim more space than is customary, and the historical refer ences are both less meagre and less stereotyped than usual. At the same time, examination requirements are by no means overlooked, and a collection of ques tions from various public examinations forms a useful appendix. Other noteworthy features are the numer ous and well-planned practical exercises and the new illustrations of familiar principles which are selected whenever possible. The diagrams and production are excellent; in fact, we have noticed nothing more repre hensible than a split infinitive. There is no doubt that the book deserves and will enjoy a wide popularity.

    Intermediate Light.


    R. A.


    By. Pp. x + 228. (London: Longmans, Green and Co., 1925.) 6s.

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