The American Journal of Science 



Established by Benjamin Silliman in 1818 



The Leading Scientific Journal in the United States 



Devoted to the Physical and Natural Sciences, with special reference to 

 Physics, and Chemistry on the one hand, and to Geology and Mineralogy 

 on the other. 



Editor : EDWARD S. DANA. 

 Associate Editors : Professor GEORGE L. GOODALE, JOHN TROWBRIDGE, W. G. FARL0W and WM. M. DAVIS 

 of Cambridge ; Professors A. E. VERRILL, HENRY S. WILLIAMS and L. V. PIRSSON, of New 

 Haven; Professor JOSEPH S. AIMES, of Baltimore ; MR. J. S. DILLER, of Washington. 

 Two volumes annually, in monthly numbers of about 80 pages each. 



This Journal ended its first series of 50 volumes as a quarterly in 1845; its second 

 series of 50 volumes as a two-monthly in 1870 ; its third series as a monthly ended Dec- 

 ember, 1895. A Fourth Series commenced in 1896. 



Subscription price, $6 per year or 50 cents a number, postage prepaid in the United States 

 $6.25 to Canada ; $6,40 to Countries in the Postal Union. Back numbers at reduced prices. 

 j^Ten-Volume Indexes, Vols. I-X XI-XX, fourth series, price one dollar. Address 



The American Journal of Science 

 New Haven, Conn. 



University Control 



By J. McKeen Cattell, Professor of Psychology in Columbia University 



r Two Hundred and Ninety-nine Unsigned Letters by Leading Men of S 

 John J. 



, J. McKeen Ca- 

 Mttkbob and Jacob ( 



i a d tell us that a new day ii 



SCIBlNCe A1ND EDUCATION 



A aeries of volumes for the promotion of scientific research and educational progre 

 VOLUME L The Foundations of Science. By H. PomoAna. Containing the authorised English •JJ*^ 

 by Gbobgb Bbucb Hadstbd of '* Science an*! Hypothesis," "The Value of Science," and « 

 and Method." In Preas. w fl 



VOLUME II. Medical Research and Education. By Richard M. Pbabob, Whjjam H. Wblcb* j^* ^* 

 Howbll, Fhaheuh P. Mall, Lbwbu.ts P. Bahbbb, Chables S. Minot, W. B. Cannon, 

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