IV CONTENTS. 



Botany and Zoology. — The Woods of the United States. C. S. Sargent, 82. — Euca- 

 lyptographia. vox Mueller: Les Organisnies Problematiques des Anciennes 

 tiers. Saporta: The Lythracea? of the United States, E. Koehne, 83. — Mono- 

 graphic der Gattuug Clematis, 0. Knutze: Recherches Anatomiques sur les 

 Organes Yegetatifs de 1'Urtica dioica. A. Gravis, 84. — List of the Plants of 

 New Brunswick. J. Fowler: North American Gamopetalae, H. N. Patterson: 

 North American Mosses and Hepatica?, C. E. Cuhmings: Phrenogamous Plants 

 of North America, J. H. Oyster : Eggs of Echidna hystrix, Haacke, 85. 



Miscellaneous Scientific Intelligence. — American Philosophical Society of Philadel- 

 phia, 86. — American Association : Meteorological Circular Letter, 87. — Diges- 

 tiou Experiments, H. P. Armsby : Chemical Periodicals, H. C. Bolton*: When 

 did Life begiD, G. H. Scribner : Paradise Found, W. F. Warren 1 , 88. 



NUMBER CLXXVI. 



Page 



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



Daxa, 89 



XIII. — Meteorite of Fomatlan, Jalisco, Mexico; by C. IT. 



Shepard, 105 



XIV. — Occurrence of Allan ite as an accessory constituent of 



many rocks; by J. P. Iddixgs and TV. Cross,. 108 



XV. — Crystals of Analcite from Phoenix Mine, Lake Superior 



Copper Region ; by S. L. Pexfield, ; 



XVI. — Differential Resistance Thermometer; by T. C. Mex- 



DEXH ALL, 114 



XVII. — Impact Friction and Faulting; by G. F. Becker,.. 116 



XVIII. — A Standard of Light; by J. Trowbridge, 128 



XIX.— On Hanksite ; by VV. E. Hiddex, 133 



XX.— Mineralogical Notes; by E. S. Dana and S. L. Pex- 



field, 136 



XXI. — Amount of moisture which Sulphuric Acid leaves in 



a Gas ; by E. TV. Morley, 140 



XXII. — Local Deflections of the Drift Scratches in Maine ; 



by G. H. Stone, 146 



XXIII. — Successional relations of the species in the French 



Old-Tertiary; by O. Meyer, 151 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Method for the Determination of Nitrogen, Arnold, 

 153. — Heat of combustion of Carbon and of Organic compounds, Berthelot 

 and Vieille, 154. — Absorbing agent for Oxygen, Yonder Pfordten, 155. — 

 Method of separating Selenium and Tellurium, Liters and Shimose ; Illuminat- 

 itig power of Ethane aud Propane, P. F. Frankland; Illuminating power of 

 Methane, Wright, 156. — Toughened Filter-papers, Francis; Crystallized 

 Tricupric sulphate, Shenstone, 157. — Molecular Weight of liquid Water, Thoji- 

 SEN, 158. 



Geology and Mineralogy. — Volcanic nature of a Pacific island not an argument for 

 little or no subsidence, J. D. Dana, 158. — Physical Features of Scotland, J. 

 Geikie, 159. — Pennsylvania Geological Survey, Reports recently issued, 

 160. — Geological Survey of New Jersey, G. H. Cook, 161. — Contributions to the 

 knowledge of the Older Mesozoic Flora of Yirginia, W. M. Fontaine, 162. — 

 Syenite and Gabbro, M. E. Wadsworth : Thermal effect of the action of aqueous 

 vapor on feldspathic rock, C. Barus: New localities of Erythrite, W. P. Blake, 

 163. 



