Proceedings 



OF THE 



American Philosophical Society 



Subscription — Three Dollars per Annum 



General Index to the Proceedings 



Volumes 1-50 (1838-1911) 



Lately Published 



Price, One Dollar 



. TRANSACTIONS 



OF THE 



American Philosophical Society 



HELD AT PHILADELPHIA 



For Promoting Useful Knowledge 



IVew Series, Vol. XXIJ, 



Part 11^ ^to, i^//. pages. 



(^Lately Published.) 



The Secular Variations of the Elements of the Orbits of the Four 

 Inner Planets Computed for the Epoch 1850.0 G. M. T. 

 By Eric Doolittle 



Subscription— Five Dollars per Volume 

 Separate parts are not sold 



Address The Librarian of the 



AMERICAN PHILOSOPHICAL SOCIETY 

 No. 104 South Fifth Street 



PHILADELPHIA, U. S. A. 



