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ON THE VARIOUS FORCES OF NATURE.

_WORKS by RICHARD A. PROCTOR._

EASY STAR LESSONS. With Star Maps for Every Night in the Year, Drawings of the Constellations, &c. Crown 8vo, cloth extra, 6s.

FLOWERS OF THE SKY. With 55 Illustrations. Small crown 8vo, cloth extra, 3s. 6d.

SATURN AND ITS SYSTEM. Revised Edition, with 13 Steel Plates. Demy 8vo, cloth extra, 10s. 6d.

FAMILIAR SCIENCE STUDIES. Crown 8vo, cloth extra, 6s.

MYSTERIES OF TIME AND SPACE. With Illustrations. Crown 8vo, cloth extra, 6s.

THE UNIVERSE OF SUNS, and other Science Gleanings. With Illustrations. Crown 8vo, cloth extra, 6s.

WAGES AND WANTS OF SCIENCE WORKERS. Crown 8vo, 1s. 6d.

_By Dr. ANDREW WILSON, F.R.S.E._

CHAPTERS ON EVOLUTION: A Popular History of the Darwinian and Allied Theories of Development. Second Edition, with 259 Illustrations. Crown 8vo, cloth extra, 7s. 6d.

LEAVES FROM A NATURALIST’S NOTE-BOOK. Post 8vo, cloth limp, 2s. 6d.

LEISURE-TIME STUDIES, chiefly Biological. Third Edition, with a New Preface and Numerous Illustrations. Crown 8vo, cloth extra, 6s.

STUDIES IN LIFE AND SENSE. With numerous Illustrations. Crown 8vo, cloth extra. 6s.

COMMON ACCIDENTS AND HOW TO TREAT THEM. With Illustrations. Crown 8vo, 1s.; cloth, 1s. 6d.

GLIMPSES OF NATURE. With 35 Illustrations. Crown 8vo, cloth extra, 3s. 6d.

_By Dr. J. E. TAYLOR, F.L.S._

THE SAGACITY AND MORALITY OF PLANTS: A Sketch of the Life and Conduct of the Vegetable Kingdom. With Coloured Frontispiece and 100 Illustrations. Crown 8vo, cloth extra, 7s. 6d.

OUR COMMON BRITISH FOSSILS, and Where to Find Them. A Handbook for Students. With over 300 Illustrations. Crown 8vo, cloth extra, 7s. 6d.