CON TK\ TS. 



Art. XLIV. — Another Episode in the History of Niag 



Falls; by J. W. Spencer. 



XLV. — Apparatus for Measuring very High Pressures; by 



A. deF. Palmer, Jr. . ....:. 



XL VI — Application of Iodine in the Analysis of A 1 k ; : 



and Acids; by C. F. WALKER and David II. M. GlL- 



LESPIE '. _. 



XL VII. — Associated Minerals of Rhodolite; by W. E. 



Hidden and J. II. Pratt ._ 40:; 



XLVIII — Revision of the Moraines of Minnesota; bv J. E. 



Tonn " 



XLIX. — Preliminary Report on some new marine Tertiary 



horizons discovered by Mr. J. B. Hatcher near Pnnta 



Arenas, Magellanes,' Chile; by A. E. Ortmann ... ... 478 



L. — Comparative Value of Different Kinds of Fossils in 



Determining Geological Age; by O. C. Marsh 483 



LI. — Families of Sauropodus Dinosauria ; by O. C. Marsh. 487 

 LII. — Biotite-tinguaite Dike from Manchester by the Sea, 



Essex County, Mass.; by A. S. Eakle 489 



LIU. — Descriptions ol new American Actinians, with critical 



notes on other species, I.; by A. E. Verrill 493 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Hyponitrous acid and Hyponitrites, Kirschner : 

 periments with Helium. Travers, 499 — Calcium nitride, Moissan, 500.— 

 um sub-oxide and peroxide produced by combustion. Forcrand: Aluminum 

 nitride, FRANCE, 501.— Enautiomorphism. Ku-ping and Pope, 502.— Doctrine of 

 Knergy; a Theory of Reality: Gravitation constant and mean density of the 

 earth, F. Richarz and O. Krigar-Mexzel: Theory of the Coherer. E, AsCH- 

 kixass, 503. — Theory of the Hall effect in au Electrolyte: Free Expansion of 

 Gases, 504. 



Geology and Mineralogy — Geological History of the Isthmus of Panama and Por- 

 tions of Costa Rica, R. T. Hill. 505. — Geology.and Mineral Resources of the 

 Judith Mountains of Montana, W. H. Weed and L. V. Pirsson, 508.— Fossil 

 Medusas, C D. Walcott: Cretaceous Foraminifera of New Jersey, R. M. 

 Bagg, Jr.: Lava-flows of the western slope of the Sierra Nevada, CaL, F. L. 

 Ransom e 509. — Bibliography and Index of North American Geology, Paleon- 

 tology, Petrology and Mineralogy for 1896, F. B. Weeks: Report on the Geol- 

 ogy of Southwest Nova Scotia, L. W. Bailey: Report on a traverse of the 

 northern part of the Labrador Peninsula from Richmond Gulf to Ungava Bay, 

 A. P. Low: Report on the Geology of the French River Sheet, R. Bell, 510. — 

 Granite des Pyrenees et ses phenomenes de contact, A. Lacroix: Igneous 

 Rocks of Tasmania, W. H. Twklvetrees and W. F. Pettehd: Sulphohahte. 

 J. H. van't H off and A. P. Saunders, 511. 



Miscellaneous Scientific Intelligence— National Academy of Sciences: Studies from 

 the Yale Psychological Laboratory; E. W. Scripture, 512. — Report on the 

 Survey of the Boundary Line between Alleghany and' Garrett Counties, 

 L. A. Bauer: Catalogue of Scientific and Technical Periodicals, I 

 H. C. Bolton: Differential and Integral Calculus, P A. Lambert, 513. 



Index to Volume \l, 514. 



