THIS short treatise is not concerned with theories but confines itself to established facts and usage and, in some cases, expresses the views of consulting engineers and manufacturers recognized as experts. The author has adopted a discursive style and, after presenting the general considerations, goes on to describe the several methods employed in various circumstances and the fittings and material used. On the activities of dry rot some valuable information is given, and there is a chapter of ventilation suggestions for different classes of buildings which should prove useful. While the book does not go nearly far enough into detail to constitute an independent guide, it would make a valuable addition to a more formal text-book by reason of the numerous practical ideas it contains.

    A Handbook on Ventilation, including Air Conditioning

    By Percy L. Marks. Pp. viii + 138 + 1 plate. (London: The Technical Press, Ltd., 1938.) 7s. 6d. net.

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    Technology. Nature 145, 501 (1940).

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