. Popular science monthly. Ohiy Material*! o/ GradesScientificallyBlended are Used On thearacter atCandy Dependsits Fitnessfor Gift Making Sold by our Sales Agents Everywhere1in Tnree Sizes $L0O5(K-25*. Refracting and Reflecting Astronomical Telescopi Standard and Portable Visual and Photographic OBJECTIVES Computed by our associate DR. F. R. riOULTON {Chicago University) OBSERVATOR IBS Specula, Planes, Eyepieces, and Circulars on requ< LOHflANN BROS. Illustration shows 5-in, with, pneumatic clock. ^SENVILLEo OHIO :: :s V^3Vol. LXXXIII, No. 5 NOVEMBER, 1913 T
. Popular science monthly. Ohiy Material*! o/ GradesScientificallyBlended are Used On thearacter atCandy Dependsits Fitnessfor Gift Making Sold by our Sales Agents Everywhere1in Tnree Sizes $L0O5(K-25*. Refracting and Reflecting Astronomical Telescopi Standard and Portable Visual and Photographic OBJECTIVES Computed by our associate DR. F. R. riOULTON {Chicago University) OBSERVATOR IBS Specula, Planes, Eyepieces, and Circulars on requ< LOHflANN BROS. Illustration shows 5-in, with, pneumatic clock. ^SENVILLEo OHIO :: :s V^3Vol. LXXXIII, No. 5 NOVEMBER, 1913 THE POPULAR SCIENCEMONTHLY EDITED BY J. McKEEN CATTELL CONTENTS The History of Dietetics. Dr. John Benjamin Nichols . .417 Jewish Colonization in Palestine. O. F. Cook 428 The National Zoological Garden. Dr. R. W. Shufeldt . . 434 The Discovery of Contact Electrification. Professor Fernando Sanford 441The Application of the Physiology of Color Vision in Modern Art. Henry G. Keller and Professor J. J. R. Macleod . . 450The Petrified Forest of Mississippi. Professor Calvin S. Brown . 466Economic Factors in Eugenics. Dr. William Leland Holt . 471How the Problems of the Rural Schools are being met. Ma
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