"Guys 
‘Vou, LXXVIL. No. 5. NOVEMBER, 1910 
1D) 
POPULAR SCIENCE 
MONTHLY 
EDITED BY J. McKEEN CATTELL 
CONTENTS 
Alexander Agassiz. Dr. ALFRED GoLpsBorouGH MAYER 3 : . 417 
Recent Developments in Physical Science. Professor ArtTHuR L. Foury 447 
Mathematical Definitions in Text-books and Dictionaries. Dr. Jos. V. 
CoLLins . : : ; : : : 4 ¢ rc ’ . 457 
The Much Misunderstood Fur Seals of Bering Sea. Grorer AROHT- 
BALD CLARK : ; : ; ; : - , . ‘ . 465 
The Paleontological Record : ; ; : ; . ; . 473 
Continuity of Development. Dr. W. D. Matthew, Dr. T. Wayland Vaughan. 
Child Study. Professor E, A. Kirxparriox : : ; i . 482 
The Relations between Teachers and Their Pupils. Principal H. A. 
Miers - P : ‘ : é . : : : - 489 
Professor Norton’s Law of Progress. Professor T. N. CARVER ¥ . 510 
The Progress of Science : 
The Harper Memorial Library at the University of Chicago ; An Autograph Letter 
from Mr. Alexander Agassiz ; Agricultural Graphics ; Soientific Items. é » 518 
THE SCIENCE PRESS 
J” LANCASTER, PA. GARRISON, N, Y¥. 
. NEW YORK: Sus-Srarion 84 
Suvete Noumeer, 30 Cxnts YEARLY SUBSCRIPTION, $3.00 
CoryRIGuT, 1909, sy THE SCIENCE PRESS 
