VI CONTENTS. 



Number -220. 



. Page. 



Art. XXVII. — Contributions to Meteorology; by Elias 



Loomis. (Twenty-third paper) 243 



XXYIII. — The Sensitive Flame as a means of Research; by 



W. LeConte Stevens 25"7 



XXIX. — The Denver Tertiary Formation; by W. Cross... 261 



XXX. — Events in North American Cretaceous History illus- 

 trated in the Arkansas-Texas Division of the South- 

 western Region of the United States ; by R. T. Hill 282 



XXXI. — A General Method for determining the Secondary 

 Chromatic Aberration for a double Telescope Objective, 

 with a description of a Telescope sensibly free from this 

 defect; by C. S. Hastings 291 



XXXII. — The distribution of Phosphorus in the Ludington 

 Mine, Iron Mountain, Michigan ; by D. H. Browne. 

 With Plates YIII-XIII 299 



XXXIIL — Palseohatteria Gredner, and the Proganosauria ; 



by G. Baur 310 



XXXIV. — Appendix : Comparison of the Principal Forms 

 of the Dinosauria of Europe and America; by O. C. 

 Marsh 323 



XXXV. — New American Dinosauria; by O. C. Marsh 332 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Presence of a new Metal in Nickel and Cobalt, Kruss 

 and Schmidt, 313. — Atomic Mass of Tin, Boxgartz and Classen: Studies 

 from the Laboratory of Physiological Chemistry, R. H. Chittenden, 314. — 

 Divergence of Electromotive force from Thermo-chemical data, E. P. Hek- 

 roun: Behavior of Metals to Light, Ktjndt, 315. — Hertz's experiments on Electro- 

 magnetic Waves, Fitzgerald and F. T. Troutox : Electrified Steam, Helsiholtz : 

 Viscosity of gases at high temperatures and a new Pyrometric method, Barus, 

 316. 



Geology and Natural History. — Brachiospongidse ; On a Group of Silurian Sponges, 

 C. H. Beecher, 316. — Waverly Group of Ohio, C. L. Herrick, 317. — Sacca- 

 mina Eriana, J W. Dawsox : Ueber eine durch die Haufigkeit Hippuritenarti- 

 ger Chamiden ausgezeichnete Fauna der oberturonen Kreide von Texas, F. 

 Roemer. 318. — Shall we teach Geology? A. Winchell : The Descending 

 Water-current in Plants and its Physiological Significance, J. Wiesser, 319. — 

 Certain Coloring Matters in Fungi, W. Zopf : Bacterial Forms found m Normal 

 Stomachs, J. E. Abelous, 320. — Mr. Morong's Journey in South America, 321. 

 — Botanic Garden at Buitenzorg, Java, Dr. Treub : Structure of the " Crown " 

 of the Root, Leox Flot, 322. 



Obituary— U. P. James, 322. 



