XXXVIII. Myth and Science; an Essay. By Tito Vignoli. Crown 8vo, 5s.

XXXIX. The Sun. By Professor Young. With Illustrations. Second Edition. Crown 8vo, 5s.

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XLI. Animal Intelligence. By G. J. Romanes, LL.D., F.R.S. Third Edition. Crown 8vo, 5s.

XLII. The Concepts and Theories of Modern Physics. By J. B. Stallo. Second Edition. Crown 8vo, 5s.

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