Vol. LXXIX,No. 1. JULY, 1911 



THE 



POPULAR SCIENCE 

 MONTHLY 



EDITED BY J. MeKEEJf CATTELL 



CONTENTS 



Pasteur, a Study in Greatness, Professor Fernando Wood Mabtin . . 5 



Concealing Coloration. Abbott H. Thayeb 20 



Expansion of the Usefulness of Natural History Museums. Professor 

 Thomas H. Montgomeby, Jr. . . . . . . . .36 



The History and Varieties of Human Speech. Dr. Edwabd Sapib . . 45 



University Standards and Student Activities. Oebis Leslie Elliott . 68 



The Psychology of Mental Deficiency. Dr. Bibd T. Baldwin . . 82 



Jacobus Henricus van 't Hoff. Professor Habey C. Jones . . .94 



The Progress of Science : 



The Amherst Idea ; The Catskill Aqueduot ; Scientific Items . . . .98 



THE SCIENCE PRESS 



LANCASTER, PA. GARRISON, N. Y. 



NEW YORK : Sub-Station 84 

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Cofybight, 1910, BT THE SCIENCE PRESS 



