C 1 () N T K N T S. 



Page 



Art. I. — Open- Air Telescope; by D.Todd. ... .. 1 



II. — New Type of Mercury Air-Pump ; by S. R. Williams. 13 



III. — Structural Relations between the Quincy Granite and 



Adjacent Sedimentary Formations ; byG. F. Loughlin 17 



IV. — Problem of Xeromorphy in the Vegetation of the Car- 

 boniferous Period ; by A. Dachnowski - 33 



V. — Discussion of the Formulas of Pearceite and Polybasite; 

 by F. 1\, Van Horn 40 



VI. — Cerussite Twins from the Begona Mine, Cerro de San 

 Pedro, San Luis Potosi, Mexico ; by W. F. Hunt and 

 F. R. Van Horn 45 



VII. — Eglestonite from ISan Mateo Count}', California ; by 



A. F. Rogers 48 



VIII.— Hydrolysis of Metallic Alkyl Sulphates; by W. A. 



Drushel and G. A. Liniiart 51 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — New Volumetric Method for Manganese, Metzger 

 and Marrs : Sulphite Method for Separating and Identifying Strontium 

 and Calcium, J. I. D. Hinds, 61. — Sketch of a Course of Chemical Philos- 

 ophy, S. Cannizzaro : Qualitative Chemical Analysis, 0. F. Tower, 62. — 

 Flames of Low Temperature supported by Ozone, R. J. Strutt, 63. — 

 Chemically Active Modification of Nitrogen, Strutt, 65. — Extremely 

 Long Waves, emitted by the Quartz-Mercury Lamp, Rubens and von 

 Baeyer : Prinzipien der Atomdynamik, J. Stark, 67. — Pressure of Light, 

 J. H. Poynting : Physics, C. R. Mann and G. R. Twiss : Principles of 

 Electro -Deposition, S. Field, 68. 



Geology and Mineralogy — United States Geological Survey, 69. — Topo- 

 graphic and Geologic Survey of Pennsylvania : North Carolina Geological 

 and Economic Survey : The Ice Age in North America, G. F. Wright, 

 70. — Characteristics of Existing Glaciers, W. H. Hobbs, 71.— Variations 

 Periodiques des Glaciers, XV me rapport, 1909, Ed. Bruckner : Physik der 

 Erde, M. P. Eudzki, 72. — Geological Survey of Sweden : Fossils and 

 Stratigraphy of the Middle Devonic of Wisconsin, H. F. Cleland, 73. — 

 Cambrian Geology and Paleontology, II, C. D. Walcott : Carboniferous 

 Flora of North-Eastern Greenland, A. G. Nathorst, 74. — Trenton Echino- 

 derm Fauna at Kirkfield, Ontario, F. Springer : Geology of the Thousand 

 Islands Region : Geology of the Poughkeepsie Quadrangle, C. E. Gordon, 

 75. — Recently Described Minerals, 76. — Bismuth Ochers from California, 

 W. T. Schaller: Natural Classification of Igneous Rocks, W. Cross, 77. 



Botany — Botanical Survey of the Galapagos Islands, 78. — Blumen und 

 Insecten, 0. von Kirchner : Pines of Australia, R. T. Baker : Plant-Life 

 on Land, F. O. Bower, 79. — Monograph of the British Lichens, A. L. 

 Smith, 80. 



Miscellaneous Scientific Intelligence — Report of the Superintendent of the 

 Coast and Geodetic Survey, O. H. Tittmann : Directions for Magnetic 

 Measurements, D. L. Hazard, 80. — U. S. National Museum, R. Rathbun : 

 Frost Data of the United States, P. C. Day : Carnegie Institution of Wash- 

 ington, 81. — National Academy of Sciences : American Indian Languages, 

 F. Boas : Nature of Enzyme Action, W. M. Bayliss : Etude de L' Atmos- 

 phere Marine par Sondages Aeriens, etc., 82. — Science Progress in the 

 Twentieth Century : Science from an Easy Chair, R. Lankester : Konsti- 

 tution der Protistenkerne, M. Hartmann, 83. — Descriptive Geometry, 

 Church and Bartlett : Power, C. E. Lucre, 84. 



Obituary — N. Story-Maskelyne : A. E. Tornebohm : C. G. Pringle : W. 

 R. Dudley : Mrs. W. P. Fleming, 84. 



