CONTENTS. Vll 



Number 281. 



Page 



Art. XXXIII. — Observations on the Derivation and Homol- 

 ogies of some Articulates ; by J. D. Dana 325 



XXXIV. — Crystallization of Herderite ; by S. L. Penfield 329 



XXXV. — Additional Note on Leucite in Sussex Co., N J.; 



by J. F. Kemp 339 



XXXVI.— Phonolitic Rocks from the Black Hills; by L. 



V Pirsson 341 



XXXVII. — General Structure of the Main Axis of the Green 



Mountains; by C. L. Whittle 347 



XXXVIII. — Notes on Apparatus for the Geological Labora- 

 tory; by J. E. Wolff 355 



XXXIX. — Diversity of the Glacial Drift along its Boundary; 



by W. Upham 358 



XL. — Elementary Expression in Thermo-electrics ; by C. 



Barus 366 



XLL- — Gases in Kilauea ; by W. Libbt, Jr. ... 371 



XLII. — Simple Method of Determining the Eccentricity of a 

 Graduated Circle with one Vernier ; by F. L. O. Wads- 

 worth 373 



XLI1L— Transformations of Mechanical into Chemical Ener- 

 gy. Third Paper. Action of Shearing Stress continued ; 

 by M. C. Lea 377 



XLIV. — Detection and Separation of Arsenic associated with 



Antimony and Tin; by F. A. Gooch and B. Hodge .. 382 



XLV. — Presence of Water in Topaz ; by P. Jajstnasch and 



J. Locke 3R6 



XLVI. — Chemical Composition and Related Physical Prop- 

 erties of Topaz; by S. L. Penfield and J. C. Minor, Jr. 387 



Appendix. — XLVII. — Restoration of Elotherium ; by O. C. 



Marsh. (With Plate IX) 40V 



XLVIII.— New Miocene Mammal ; by O. C. Marsh 409 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Effect of absorbed Hydrogen on the Electrical Proper- 

 ties of Palladium, Brucchietti: Determination of the Molecular Formulas of 

 Liquids by means of their Molecular Surface Energy, Ramsay, 396. — Manufac- 

 ture of Oxygen from Calcium Plumbate, Kassner, 398. — Base-forming Function 

 of Iodine. V. Meyer and Hartmann, 399. — Diminution of the force of gravity 

 with the height, determined by weighing. F. Richarz and 0. K. Menzel : Law 

 of candle flames, P. G-lan, 400. — Ring magnet for obtaining intense magnetic 

 fields, H. DuBois, 40 1 . 



Geology and Mineralogy — Age of the White Limestones near Warwick, Orange 

 Co., N. Y., J. F. Kemp and A. Hollick, 401. — Cretaceous Flora of Long Island, 

 A. Hollick : Monograph of the Devonian Fauna of the south of England, G. F. 

 Wheoborne, 402.— Topaz from Texas, G. F. Kuxz, 403. — Les Enclaves des 

 Roches Volcanique, A. Lacroix: Laramie and the overlying Livingston Forma- 

 tion in Montana, with Report of Flora, W. H. Weed and F. H Knowltox, 404. 



Miscellaneous Scientific Intelligence — Bulletin of the American Museum of Nat- 

 ural History, 405. — Biological lectures delivered at the Marine Biological Labo- 

 ratory of Wood's Holl: Star Catalogue, 406 



