^^\ 



PROCEEDINGS 



OF THE 



. American Philosophical Society 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



t Vol. L. May-June, 191 i. No. 199. 



CONTENTS. 



Notes on Cannon — Fourteenth and Fifteenth Centuries. By Charles E. 



Dana 147 



Moreau de Saint Mery and his French Friends in the American Philosophical 



Society. By Joseph G. Rosengarten 168 



The New History. By James Harvey Robinson 179 



The Atomic Weight of Vanadium Determined from the Laboratory Work of 



Eighty Years. By Dr. Gustavus D. Hinrichs 191 



The Origin and Significance of the Primitive Nervous System. By G. H. 



PIrker 217 



The Stimulation of Adrenal Secretion by Emotional Excitement. By W. B. 



Cannon, M.D 226 



The Cyclic Changes in the Mammalian Ovary. By Leo Loeb 228 



The Solar Constant of Radiation. By C. G. Abbot 235 



Self-luminous Night Haze. By E. E. Barnard 246 



Spectroscopic Proof-of the Repulsion by the Sun of Gaseous Molecules in the 



Tail of Halley's Comet. By Percival Lowell 254 



The New Cosmogony. By T. J. J. See 261 



The Extension of the Solar System Beyond Neptune, and the Connection 



Existing between Planets and Comets. By T. J. J. See 266 



The Secular Effects of the Increase of the Sun's Mass upon the Mean INIotions, 



Major Axes and Eccentricities of the Orbits of the Planets. By T. J. 



J. See 269 



On the Solution of Linear Differential Equations of Successive Approxima- 

 tions. By Preston A. Lambert 274 



Problems in Petrology. By Joseph P. Iddings 286 



A Study of the Tertiary Floras of the Atlantic and Gulf Coastal Plain. By 



Edward W. Berry 301 



An Optical Phenomenon. By Francis E. Nipher 316 



Obituary Notices of Members Deceased 



Jacobus Henricus Van't Hoff iii 



George Frederick Barker, M.D., Sc.D., LL.D xiii 



PHILADELPHIA 

 THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 

 1911 



