CONTENTS OF VOLUME XLVII. 



Number 277. 



Page 



Art. I. — Researches in Acoustics; by A. M. Mayer 1 



II. — Petroleum in its relations to Asphaltic Pavement ; by 



S. F. Peckham 28 



III. — The age of the extra-moraine fringe in Eastern Pennsyl- 

 vania ; by E. H. Williams, Jr. 34 



IV. — Notes on the Cambrian Rocks of Pennsylvania, from 



the Susquehanna to the Delaware; by C. D. Walcott.. 37 



V. — The Internal Work of the Wind; by S. P. Langley. 



(WithPlates I-V)... 41 



VI. — Post-Glacial Eolian Action in Southern New England ; 



by J. B. Woodworth - . 63 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Production of Silver hyponitnte from Hydroxylamine, 

 W". Wislicenus: Electrolysis of Alkali Salts, Arrhenius, 72.— Preparation of 

 Chromium, Manganese and Uranium in the Electric Furnace, Moissan and Violle, 

 73. — Production of Sarcolactic acid by the Fermentation of Inactive Lactic acid, 

 Frankland and MacGregor: Heats of Combustion of Gaseous Hydrocarbons, 

 Berthelot and Matignon, 74. — Action of a Leevolactic Ferment on Dextrose, 

 Rhamnose and Mannitol, Tate: Lead Tetracetate, Hutchinson and Pollard, 75. 

 — Thermochemistry of Chloracetic acid, Tanatat : A method of using the arc 

 light for reading rooms and libraries, Dobson: Application of light waves to 

 metrology, Michelson, 76. — Radiation of heated gases, Paschen: Electric 

 radiations in Copper Filings, Craft: Absorption of Electrical waves, Klem- 

 encic: A new form of Contact maker, Bedell, Miller and Wagner, 77. 



Geology and Mineralogy — Geological Survey of Georgia, J. W. Spencer: The 

 Geology of Mexico, 78. — Geological Survey of New Jersey: Elementary Paleon- 

 tology for geological students, H. Woods: Geology of Boston Basin, Crosby, 79. 



Miscellaneous Scientific Intelligence — The Wilder quarter-century Book, 80. 



Obituary — Dionys Stur: John Tyndall, 80. 



