CONTEXTS. 



Abt. I. — "Relation which the former Orbits of those Meteor- 

 ites that are in our collections and that were seen to fall, 

 had to the Earth's Orbit ; by H. A. Newton _ 1 



II. — History of Changes in the Mt. Loa Craters: by J. D. 



Daxa. * (With Plates I, II, III) . . . . 14 



III. — Summit Crater of Mt. Loa in 1880 and 1886; by W. 



T. Brigham and J. M. Alexander 33 



IV. — Explanation of the action of a Magnet on Chemical Ac- 

 tion ; by H. A. Rowland and L. Bell 39 



V. — Wave-like Effects produced by the Detonation of Gun- 



Cotton ; by C. E. Menroe. ('With Plate IV) 48 



VI. — Mode of Reading Mirror Galvanometers, etc. ; by R. 



W. YVili.sox 50 



VII. — Bertrandite from Mt. Antero, Colorado; by S. L. 



Penfield . 52 



VIII. — Some Localities of Post-Tertiary and Tertiary Fossils 



in Massachusetts ; by W. W. Dodge 56 



IX. — A Cordierite Gneiss from Connecticut ; by E. O. 



Ho VEY 57 



X. — The Flow of Solids : a Xote; by \V Hallock 59 



SCIENTIFIC INTELLIGENCE. 

 Chemistry and Physics — Modem Theories of Chemistry, L. Meyer. 60. — Exper- 

 iment to illustrate Valence. Lepsies : Action of Hydrogen sulphide on Arsenic- 

 acid. Bbanneb and Tomicek, 62. — Elements and Meta-elements. Crookes.'63. — 

 Measurement of High Potential. A. Yoller. 66. — Fluorescence. B. Walter : 

 Grunwald's hypothesis in spectrum analysis : Penetration of Daylight in 

 the water of Lake Geneva and of the Mediterranean. Fol and Sabasin, 67. — 

 Treatise on Electricity and Magnetism. E. Mascart and J. Joebert 

 Geology and Mineralogy — Geological Survey of Ohio: Economic Geology, 68. — 

 Fauna and Flora of the Trias of New Jersey and the Connecticut Valley. 

 Newberry. TO. — Archaaan areas of Northern New Jersey and Southeastern 

 New York. X. L. Brixton : Annual Report of the State Geologist of New 

 Jersey for the year 18S7 : Archaean Plant : Organization of the Fossil Plants of 

 the Coal Measures. W. C. Williamson, 71. — Einleitung in die Palaophytologie 

 vom botanischen Standpunkt aus, Solms-Laubach : Das Aulitz der Erde von 

 Eduard Suess. 72.— Chert. Gr. J. Hinde : Dumortierite from a new locality. 

 M. Levy and Lacboix : Zircon from North Carolina : Seventh Annual Report 

 of the State Mineralogist of California for the year ending Oct. 1, 18s 7. vy. 

 Ibelan: Contributions to the Mineralogy of the Pacific Coast. W. LlNDGBEN, 

 73. — Materialien zur Mineralogie Russlands. von Kokscharow : Per Meteorit 

 von Nowo-TJrei, von M. Jerofeieff aud P. Latschinoff. 74. 

 Botany and Zoology — Recent advance in Vegetable Histology. A. Dumoxt, 75. A. 

 LeBloiSj 76. — Botauical Works of the late George Engelmann. 76. — Excursions 

 ZooloLdques daus les Isles de Fayal et de San Miguel. J. de Gueene, 7 7. 



entific Intelligence — Meeting of the American Association for the 



incement of Science, for 1888 : Annual Report of the Board of Regents of 



sonian Institution: Lick Observatory. University of California. 7-. — 



r of interest to Societies, Libraries and' Geologists : International Geo- 



a 58 : Hayden Memorial Geological Fund: Medals of the Geological 



iety of London. 19. 



—Roland Duer Irving. A. H. Wobthen, - 



