Coal, and what we get from it. By Professor Raphael Meldola, F.R.S., F.I.C. With several Illustrations. 2s. 6d.

Colour Measurement and Mixture. By Captain W. de W. Abney, C.B., R.E. With numerous Illustrations. 2s. 6d.

The Making of Flowers. By the Rev. Professor George Henslow, M.A., F.L.S. With several Illustrations. 2s. 6d.

The Birth and Growth of Worlds. A Lecture by Professor A. H. Green, M.A., F.R.S. 1s.

Soap-Bubbles, and the Forces which Mould Them. A course of Lectures by C. V. Boys, A.R.S.M., F.R.S. With numerous Diagrams. 2s. 6d.

Spinning Tops. By Professor J. Perry, M.E., D.Sc., F.R.S. With numerous Diagrams. 2s. 6d.

Our Secret Friends and Foes. By P. F. Frankland, F.R.S. With numerous Illustrations. New Edition, 3s.

Diseases of Plants. By Professor Marshall Ward, M.A., F.R.S., F.L.S. With numerous Illustrations. 2s. 6d.

The Story of a Tinder-Box. By the late Charles Meymott Tidy, M.B., M.S. With numerous Illustrations. 2s.

Time and Tide. A Romance of the Moon. By Sir Robert S. Ball, LL.D., Royal Astronomer of Ireland. With Illustrations. Third Edition, revised. 2s. 6d.

The Splash of a Drop. By Professor A. M. Worthington, F.R.S. With numerous Illustrations. 1s. 6d.