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CONTENTS 



Page 



Art. I. — Measurement of the Peruvian Are ; by E. D. 



Preston 1 



II. — Neutralization of Induction ; by J. Trowbridge and 



S. Sheldon 17 



III. — Divergent Evolution and the Darwinian Theory ; by 



J. T. Guliok 21 



IV. — Devonian System of North and South Devonshire ; by 



H. S. Williams 31 



V. — Zinciferous Clays of Southwest Missouri and a Theory 

 as to the growth of the Calamine of that section ; by 



W. II. Seamon _ 38 



VI. — Minium from Leadville ; by J. D. Hawkins 42 



VII— Mineral ogical Notes ; by VV. P. Blake 43 



VIII. — Spectrum of £ Ursae Majoris ; by E. C. Pickering. . 46 

 IX. — Contributions to Mineralogy, No. 46 ; by F. A. Genth 47 



X. — Origin of Normal Faults ; by T. M. Reade 51 



XI.- — Estimation of the Optical Angle by Observations in 



Parallel Light ; by A. C. Lane _ _ 53 



XII. — New Stone Meteorite ; by L. G. Eakins 59 



XIII. — Barium Sulphate from Perkins' Mill, Templeton, 



Province of Quebec ; by E. S.Dana 61 



XIV.— Appendix. — Description of New Dinosaurian Rep- 

 tiles ; by O. C. Marsh. With Plate I 81 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics. — Decomposition of Carbon disulphide by shock, Tada^E, 

 ' 65.— Light and Electricity. Righi : Galvanic Polarization, WARBURG^M^p^e 

 modification of the method of Telescope and Scale reading, DuBqisgM 



Geology and Mineralogy. — North American Geology anel^Pala^B B^S. A. 

 Miller: Geological and Natural History Survey of Minnjp^^wthe year 

 1888, N. H. Winchell, 67. — Geology of the Quicksilver Deposits of the Pacific 

 Slope, G. F. Becker, 68. — New locality of Lower Silurian Fossils in the Lime- 

 stones of Columbia Co., N. Y., I. P. Bishop, 69. — Shallow-water origin of the 

 Cincinnati shale and limestone : Lower Cretaceous of the Sau Carlos Mountains, 

 Mexico. 70. — Sabre-toothed tiger and other Quaternary Mammals of Florida, 

 J. Leidy : Fossils of the Western Taconic limestone in the eastern part of 

 Dutchess Co.. N. Y , W. B. Dwight: Cambrian fossils from the limestone of 

 Nahant, Mass., A. F. Fcerste : Development of some Silurian Brachiopoda, C. 

 E. Beecher and J. M. Clarke : Devonian Plants from Ohio, J. S. Newberry, 

 71. — U. S. Geological Survey Bulletins: Geological Survey of Missouri, A. 

 Winslow : Geologie der Miinsterthals in Badischen Schwarzwald, A. Schaiidt : 

 Contribuzioni alia Flora Fossile dei Terreui Terziarii della Liguria, S. Squinabol, 

 72. — Jarosite from Utah, F. A. Genth: Brief notices of some recent^ de- 

 scribed Minerals. 73. — Das Reich der Krystalle, H. Baumh alter, 75. ^ 



Botany. — Die naturlichen Pflanzenfamilien, A. Engler und K. Pbantl, 75. — 

 Effects produced on some tropical plants by a temperature of 40 to 34 degrees, 

 77. — Apparatus for easily controlling temperatures at or below freezing, for 

 experiments on the relations of plants to cold, 78. — Disintegration of woody 

 tissues: Illustrations of West American Oaks, A. Kellogg, 79. 



Miscellaneous Scientific Intelligence. — Ascent of a Peak in the Cascade Mountains, 

 J. Roll, 80. 



