CONTENTS. 



Number 69. 



Page 

 Art. XVIII. — Discharge-current from a Surface of large 



Curvature ; by J. E. Almy _ 1 75 



XIX. — Octahedrite and Brookite, from Brindletown, North 



Carolina ; by H. H. Robinson _ _ . _ 180 



XX. — Behavior of Small closed Cylinders in Organ-pipes ; 



by B. Davis '. 185 



XXI. — Caesium-Tellurium Fluoride ; by H. L. Wells and 



J. M. Willis 190 



XXII. — Double Chlorides of Caesium and Thorium ; by H. 



L. Wells and J. M. Willis _. 191 



XXIII. — Studies of Eocene Mammalia in the Marsh Collec- 

 tion, Peabody Museum ; by J. L. Wortman 193 



XXIV. — Separation of the Least Volatile Gases of Atmos- 

 pheric Air, and their Spectra ; by G. D. Liveing and 

 J. Dewae . 207 



XXV. — Estimation of Calcium, Strontium, and Barium, as 



the Oxalates ; by C. A. Peters. _. 216 



XXVI.— Calaverite; by S. L. Penfield and W. E. Ford 225 



SCIENTIFIC INTELLIGENCE. 



Miscellaneous Scientific Intelligence — Temporary Set, C. Baruh: Some new 

 rock-types', 247. 



Obituary— Joseph LsConte, 24 8. 



