﻿CONTENTS. Vll 



NUMBER CXCT. 



Page. 



Art. XXXVIIX. — The higher Oxides of Copper ; by Thomas 



B. Osborne - 333 



XXXIX. — The structure of the Triassic formation of the 



Connecticut Valley ; by William M. Davis 342 



XL. — Researches on the Lithia Micas; by F. W. Clarke.. 353 



XLI. — Thickness of the Ice in Northeastern Pennslyvania 



during the Glacial Epoch; by John C. Branner 362 



XLII. — Time of contact between the Hammer and String in 



a Piano ; by Charles K. Wead . 366 



XLIII. — Photographic Determinations of Stellar Positions ; 



by B. A. Gould 369 



XLIV. — Lucasite, a new variety of Vermiculite ; by Thomas 



M. Chatard . . . 375 



XLV. — Crystallographic Notes; by W. G. Brown 317 



XLVI. — Chemical composition of Ralstonite ; by S. L. Pen- 

 field and D. N. Harper 380 



XL VII. — Mineralogical Notes ; by Edward S. Dana 386 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Geological Time: Address of Professor G. H. Darwin, 

 390. — On the Genesis of the Elements, 400. — On Austrium, a new metallic 

 element, Linneman, 405. — On Holmium, Dysprosium and Gadolinium, Lecoq 



DE BdSBAUDRAN, 406. 



Geology and Natural History. — Geological Nomenclature: Meeting of the Inter- 

 national Committee at Geneva, 406. — Geological Age of the North Atlantic 

 Oceanic basin and Origin of Eastern American sediments, 407. — Annual Report 

 of the Geological Survey of Pennsylvania for 1885, 408. — Catalogue of the 

 Blastoidea in the Geological Department of the British Museum, R. Etheridge. 

 Jr, and H. Carpenter, 409.— Revision of the Palasocrinoidea, C. Wachsmuth 

 and F. Springer: A Natural System of Mineralogy with a Classification of 

 native Silicates, T. Sterry Hunt, 410. — Flowers, Fruits and Leaves, Sir John 

 Lubbock: Lectures on the Physiology of Plants, Sidney H. Vines, 411.— A 

 Preliminary Synopsis of North American Carices, including those of Mexico, 

 Central America, etc., 412. 



Miscellaneous Scientific Intelligence. — British Association in Birmingham, 412.— 

 Obituary. — Colonel Charles "Whittlesey, 412. 



