PROCEEDINGS 



OF THE 



AMERICAN PHILOSOPHICA:L,;(SOCIETY 



HELD AT PHILADELPHIA 

 FOR PROMOTING USEFUL KNOWLEDGE 



Vol. XLV. ^^ January- April, 1906. No. 182. 



CONTENTS. 



Stated Meeting, January 5 3 



Stated Meetmg, January /p 4 



A Case of Persistent Vitality in Seeds. By Burnet Landreth 5 



Stated Meeting, Febriiaiy 2 9 



Stated Meeting, February 16 9 



Stated Meeting, March 2 9 



Stated Meeting, March 16 10 



Stated Meeting, April 6 10 



Ge7ieral Meeting, April iy'20 10 



The Statistical Method in Chemical Geology. By F. W. Clarke 14 

 On a Possible Reversal of Deep-sea Circulation and its Influence on 



Geologic Climates. By Thomas C. Chamberlin 33 



An International Southern Telescope. By Edward C. Pickering. . 44 



The Human Harvest. By David Starr Jordan 54 



Heredity and Variation ; Logical and Biological. By William 



Keith Brooks 70 



The Elimination of Velocity Effects in Measuring Pressures in a 



Fluid Stream. By Francis E. Nipher 77 



The Present State of the Question Regarding the First Principles of 



Theoretical Science. By Josiaij Royce .,. 82 



A Biographical Notice of J. Peter Lesley. By Henry M. Chance i 



PHILADELPHIA 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 



1906 



