>NTENTa vii 



Number 233. 



Page 



Art. XLI. — Experiments with a Pendulum-electrometer ; by 



A. M. Mayer 327 



XLII. — Electric Potential as measured by Work; by A. M. 



Mwkk " 334 



XLI1I. — Elementary proof of the Earth's Rigidity; by 



G. F. Becker 336 



XLIV. — Hornblende of St. Lawrence County, X. Y.; by 



G. II. Williams I 352 



XLV. — Note on some secondary minerals of the Amphibole 



and Pyroxene groups; by Whitman Cross 359 



XL VI. — Spangolite, new Copper Mineral ; by S. L. Penfield 370 

 XLVII. — Archa?an axes of Eastern N. A.; by J. D. Dana 378 

 XLVIII. — Metamorphic Strata of Southeastern New York ; 



by F. J. H. Merrilt _ _ 383 



XLIX. — The Radiant Energy of the Standard Candle ; Mass 



of Meteors ; by C. C. Hutchins 392 



L. — Meteoric Iron from North Carolina; by L. G. Eakins._ 395 

 LI. — Distinctive Characters of the order Hallopoda ; by O. C. 



Marsh 415 



LII. — Additional Characters of the Ceratopsidre, with notice 



of Xew Cretaceous Dinosaurs ; by O. C. Marsh. (With 



Plates V-VEL) 418 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Determination of Gas volumes by Direct Reading, 

 Lemege, 396. — Nature of Solutions, Pickering: Density of Fluorine, Moissan, 

 397. — Determination of Oxygen dissolved in "Water, Thresh: Method of distin- 

 guishing Hydrogen Arsenide from Hydrogen Antimonide, Brunn, 398. — Atomic 

 Mass of Gold. Mallet: Musical Tones by means of unlike formed Waves, 

 KoxiG, 399. — Electrical Vibrations in rarefied air without Electrodes, Moser: 

 Magnetization in strong fields at different temperatures, DuBois : Spectra of 

 Chemical Elements, Rydberg : Velocity of the Propagation of Gravitation, 

 Van Hepperger, 400. — Electricity in Modern Life, de Tunzelmann, 401. 



Geology. — Coal formation in southeastern England, W. Boyd-Dawkins, 401. — 

 Geological Society of America: Quaternary History of Mono Valley, California, 

 I. C. Russell: Catalogue of British Fossil Vertebrata, Woodward and 

 Sherborn. 402. — Mammalia of the Uinta formation, W. B. Scott and H. F. 

 Osborn, 403. — Underground Water in the Western Districts of New South 

 Wales. II. C. Russell: Lower Carboniferous limestone series in Central Texas, 

 R. S. Tarr : Geographic Development of Northern New Jersey. W. M. Davis 

 and J. W. Wood, Jr.: Trap sheets of the Connecticut Valley, W. M. Davis 

 and C. L. Whittle: Italian Volcanic soils, L. Ricciardi, 404. — Fauna der 

 Gaskohle, etc., A. Fritsch, 405. — Fossil plants, J. W. Dawson : Bala Volcanic 

 Rocks, A. Harker, 406.— Scapolite Rock, F. L. Nason, 407. 



Botany and Zoology. — Histology as a Basis for Classification: Stem Structure of 

 lodes Tomentilla, B. L. Robinson: Garnsey's Translation of Sachs's History of 

 of Botany, 407. — Eyes of Arthropoda, J. M. Clarke, 409. — Prodromus Faunas 

 Mediterranean, J. V. Carus: Corals and Coral Islands, J. D. Dana, 410. 



Astronomy. — Diurnal Variation of Terrestrial Magnetism, A. Schuster: Biblio- 

 graphie Generate de l'Astronomie, Houzeau and Lancaster, 41 1. 



Miscellaneous Scientific Intelligence. — National Academy of Sciences: Great depth 

 in South Pacific Ocean, 412. — Transactions of Kansas Academy of Science: 

 Loubat Prize of the Academy: Essays of an Americanist. D. G. Brintox, 413. 

 Obituary. — Richard Owen. 



