Vol. LIV.J Established by Edward L. Youhans. [No. 2. 



APPLETONS' 



POPULAR SCIENCE 



MONTHLY. 







DECEMBER, 1898. 



EDITED BY WILLIAM JAY YOVMANS. 



CONTENTS. ^ PA0 , 



I. Wheat-growing Capacity of the United States. By E. Atkinson. . 145 

 II. The Racial Geography of Europe. The Jews. By Prof. William 



Z. Ripley. (Illustrated.) 163 



III. The Playgrounds of Rural and Suburban Schools. By I. G. Oaklet. 176 



IV. Up the Skeena River. By George A. Dorset, Ph.D. (Ulus.).. 18l 

 V. Light and Vegetation. By Prof. D. T. Macdougal 193 



VI. The Stone Age in Egypt. By J. de Morgan : 202 



VII. Superstition and Crime. By Prof. E. P. Evans 206 * 



VIII. A Geological Romance. By Prof. J. A. Udden. (Illustrated.) . . . 222 



IX. The Season of the Year. By Grant Allen 230 



X. -Brain Weights and Intellectual Capacity. By Joseph Simms, M. D. 243 



XI. Speleology, or Cave Exploration. ;jJBy M. E. A. Martel 255 



XII. Sketch of Charles Henry Hitchcock. (With Portrait.) 260 



XIII. Editor's Table : Evolution and Education— David Ames Wells.— A Bor- 



rowed Foundation 269 



XIV. Scientific Literature 274 



XV. Fragments of Science 282 



NEW YORK: 

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Coptrioht, 1898, bt D. APPLETON AND COMPANY. 



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