Vol. XLIIL] Established by Edward L. Youmans. [No. 4.
POPULAR SCIENCE MOKTILY.
��AUGUST, 1893. EDITED BY WILLIAM JAY YOUMAKS.
CONTENTS. TAGE
I, Studies of Animal Speech. By Prof. E. P. Evans 433
II. Learn and Search. By Prof. Rudolph Viechow 440
III. Protection from Lightning. By Alexander McAdie. (Illus.). 453
IV. Success with Scientific and other Meetings. By George Iles . . 463 V. Professor Weismann's Theories. By Herbert Spencer 473
VL The Color Changes of Frogs. By Prof. C. M. Weed. (Illus.). 490 VII. Why a Film of Oil can calm the Sea. By G. W. Littlehales.
(Illustrated.) 494
VIII. How Plants and Animals Grow. By Dr. Manly Miles 503
IX. The Revival of Witchcraft. By Ernest Hart. (Concluded.). 516 X. Some Remarkable Insects. By William J. Fox. (Illustrated.). 527 XL The Material View of Life and its Relation to the Spiritual.
By Prof. Graham Lusk 533
XII. Sealing in the Antarctic 539
XIII. Honey and Honey Plants. By Dr. G. G. Groff 545
XIV. Sketch of Paolo Mantegazza. By Prof. Frederick Starr.
(With Portrait.) 549
XV. Editor's Table : a Great Work concluded 552
XVI. Literary Notices 554
XVII. Popular Miscellany 565
XVIIL Notes 575
NEW YORK: D. APPLETON AND COMPANY,
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COPYHIGHT, 1893, BT D. APPLETON AND COMPANY. Entered at the Post-Offlce at New York, and admitted for transmission through the mails at second-class rates.
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