“The problems discussed with great ability and lucidity, and often in a most suggestive manner, by Prof. Pearson, are such as should interest all students of natural science.”—Natural Science.

XVIII. PROPERTY: ITS ORIGIN AND DEVELOPMENT. By Ch. Letourneau, General Secretary to the Anthropological Society, Paris, and Professor in the School of Anthropology, Paris.

“M. Letourneau has read a great deal, and he seems to us to have selected and interpreted his facts with considerable judgment and learning.”—Westminster Review.

XIX. VOLCANOES, PAST AND PRESENT. By Prof. Edward Hull, LL.D., F.R.S.

“A very readable account of the phenomena of volcanoes and earthquakes.”—Nature.

XX. PUBLIC HEALTH. By Dr. J. F. J. Sykes. With numerous Illustrations.

“Not by any means a mere compilation or a dry record of details and statistics, but it takes up essential points in evolution, environment, prophylaxis, and sanitation bearing upon the preservation of public health.”—Lancet.

XXI. MODERN METEOROLOGY. An Account of the Growth and Present Condition of some Branches of Meteorological Science. By Frank Waldo, Ph.D., Member of the German and Austrian Meteorological Societies, etc.; late Junior Professor, Signal Service, U.S.A. With 112 Illustrations.

“The present volume is the best on the subject for general use that we have seen.”—Daily Telegraph.

IMPORTANT ADDITION TO THE SERIES.