CONTENTS 



Page. 



Art. XXVII. — Contributions to Meteorology ; by Elias 

 ' Loomis. (Twenty-third paper) 243 



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



W. LeConte Stevens 257 



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 VIII-XIII . 1 299 



XXXIIL — Palasohatteria Credner, 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, Krtjss 

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

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

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

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

 magnetic "Waves, Fitzgerald and F. T. Trouton : Electrified Steam, Helmholtz : 

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

 316. 



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

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

 mina Eriana, J W. Dawson : 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. "Wiesner, 319. — 

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

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

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

 of the Root, Leon Flot, '322. 



Obituary.— -TJ. P. James, 322. 



