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SOUND, LIGHT, HEAT, AND THERMODYNAMICS.

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DAY.—NUMERICAL EXAMPLES IN HEAT. By R. E. Day, M.A. Fcp. 8vo., 3s. 6d.

EMTAGE.—LIGHT. By W. T. A. Emtage, M.A. With 232 Illustrations. Crown 8vo., 6s.

HELMHOLTZ.—ON THE SENSATIONS OF TONE AS A PHYSIOLOGICAL BASIS FOR THE THEORY OF MUSIC. By Hermann von Helmholtz. Royal 8vo., 28s.

MADAN.—AN ELEMENTARY TEXT-BOOK ON HEAT.

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SMITH.—THE STUDY OF HEAT. By J. Hamblin