CONTENTS. V 



Botany. — Course of practical instruction in Botany, F. 0. Bower and S. H. Vines : 

 Text-Book of Structural and Physiological Botany, 0. W. Thome and A. W. 

 Bennett: Le Potager d'un Curieux: Histoire, Culture, et Usages de 100 

 Plantes comestibles peu connues ou inconnues, A. Pailleux et D. Bois, 164. — 

 Contributions to American Botany. S. Watson, 166. —Talks afield about Plants 

 and the Science of Plants, L. H. Bailey, Jr., 167. 



Miscellaneous Scientific Intelligence. — Report of the Secretary of the Smithsonian 

 Institution, Spencer F. Baird, 167. — American Association for the Advance- 

 ment of Science : Report on the Museums of America and Canada, V. Ball, 168. 

 Obituary— -T. R. Peale, 1 68. 



NUMBER CLXXVII. 



Page 



Art. XXIV. — Origin of Coral Reefs and Islands ; by J. D. 



Dana, 169 



XXV. — Quartz-twin from Albemarle County, Virginia ; by 



W. G. Brown, ... 191 



XXVI. — Impact Friction and Faulting ; by G. F. Becker, 194 

 XXVII. — Transmission of Light by Wire Gauze Screens ; 



by S.rP. Langley, ...._.... 210 



XXVIII. — Geological Relations of the Gypsum Deposits in 



Cayuga County, N. Y. ; by S. G. Williams, 212 



T 1IX. — Variation of the Magnetic permeability of Nickel 



at different temperatures ; by C. A. Perkins, . 218 



XXX. — Enlargements of Hornblende fragments ; by C. R. 



Van Hise, : 231 



XXXI. — Three Masses of Meteoric Iron from Glorieta Moun- 

 tain, near Canoncito, Santa Fe County, New Mexico ; 



by G. F. Ktjnz. (With four plates), 235 



SCIENTIFIC INTELLIGENCE. 



Physics. — "Transfer-resistance" in Electrolytic and Voltaic Cells, G-. Gore, 238. 

 — Electrical Resistance of the new alloy Platinoid, Bottomlet: Annual change 

 of the Aurora Borealis, 240. — Note on a preliminary Comparison between the 

 Dates of Cyclonic Storms in Great Britain and those of Magnetie Disturbances 

 at the Kew Observatory, B. Stewart and W. L. Carpenter : Properties of 

 Matter, P. G. Tait: Mathematical theory of Electricity and Magnetism, H. W. 

 Watson and S. H. Burbury, 241. 



Geology and Natural History. — Report of Progress of the Geological and Natural 

 History Survey of Canada during the years 1882-83-84, A. R. C Selwyn, 241. 

 — Aralo-Caspian and Mediterranean Basins, T. P. Jameson, 243. — Union 

 Group, Pacific Ocean. — Spiraxis major and Sp. Randalli of Newberry, large 

 Screw-like fossils from the Chemung group of Northern Pennsylvania and 

 Southern New York, J. S. Newberry : Geological Map of the United States, 

 W. J. McGee : Macfarlane's Geological Railway Guide, 244. — Impact Friction 

 and Faulting, G. F. Becker: Plantes a. Fourmis, 245. — Lloyd's Drugs and 

 Medicines of North America : Transactions and Proceedings of the New 

 Zealand Institute for 1884: Revision of the North American Species of the 

 Genus Scleria, N. L. Britton, 246. — Beitrag zur Kenntniss der Sarraceniacecn, 

 P. Zipperer: Charles "Wright, 247. 



Miscellaneous Scientific Intelligence. — Transactions of the Connecticut Academy 

 of Arts and Sciences : Catalogue of Scientific and Technical Periodicals (1665 

 to 1882) together with Chronological Tables and a Library Check-List, H. C. 

 Bolton, 247. — Contributions to North American Ethnology, J. W. Powell : 

 Microscope in Botany, a Guide for the Microscopic Investigation of Vegetable 

 Substances, J. W. Behrens, 248. 

 Obituary. — Henri Fresca : Henri Milne Edwards : W. C. Kerr, 248. 



