viii TABLE OF CONTENTS 



The Present Problems of Inorganic Chemistry 258 



SIR WILLIAM RAMSAY 



SECTION B ORGANIC CHEMISTRY. 



The Relations of Organic Chemistry to Other Sciences .... 276 



JULIUS STIEGLITZ 



Present Problems of Organic Chemistry ....... 285 



WILLIAM ALBERT NOYES 



SECTION C - - PHYSICAL CHEMISTRY. 



The Relations of Physical Chemistry to Physics and Chemistry . . . 304 

 JACOBUS HENRICUS VAN 'T HOFF 



The Physical Properties of Aqueous Salt Solutions in relation to the Ionic 



Theory 311 



ARTHUR A. NOYES 



Short Papers ............ 324 



SECTION D PHYSIOLOGICAL CHEMISTRY. 



Problems in Nutrition ........ . 327 



OTTO COHNHEIM 



The Present Problems of Physiological Chemistry 335 



RUSSELL HENRY CHITTENDEN 



Short Paper 351 



Bibliography: Department of Chemistry 352 



Special Works of Reference for Paper of Professor Frank W. Clarke . . 354 



Special Works of Reference for Section of Physiological Chemistry . . 355 



DEPARTMENT XI ASTRONOMY 



Fundamental Conceptions and Methods in Astronomical Science . . 360 



LEWIS Boss 



The Light of the Stars 374 



EDWARD CHARLES PICKERING 



SECTION A ASTROMETRY. 



The Development of Celestial Mechanics during the Nineteenth Century . 387 



OSKAR BACKLUND 



Statistical Methods in Stellar Astronomy ....... 396 



JACOBUS CORNELIUS KAPTEYN 



Short Papers ..." 426 



SECTION B ASTROPHYSICS. 



The Relations of Photography to Astrophysics ...... 429 



HERBERT HALL TURNER 



