CONTENTS. 



Page 



Art. XVII I. — Gas Thermometer at High Temperatures ; by 



L. Holborn and A. L. Day 1*71 



XIX. — Certain Schists of the Gold and Diamond Regions of 



Eastern Minas Geraes, Brazil ; by (X A. Derby 207 



XX. — Monazite; by O. A. Derby.. 217 



XXI. — Spectra of Hydrogen and the Spectrum of Aqueous 



Vapor ; by J. Trowbridge 222 



XXII. — New Effect produced by Stationary Sound- Waves ; 



by B. Davis 231 



XXIII. — Interesting Developments of Calcite Crystals ; by 



S. L. Penfield and W. E. Ford " 237 



XXIV. — Method of Measuring Surface Tension ; by J. S. 



Stevens 245 



SCIENTIFIC INTELLIGENCE. 



Geology and Mineralogy — Glacial Gravels of Maine and their associated depos- 

 its, G. H. Stoxe : Illinois Glacial Lobe, F. Leverett, 247. — Geography of the 

 Region about Devils Lake and the Dalles of the Wisconsin with sonic notes on 

 its Surface Geology, R. D. Salisbury and W. W. Attwood, 248. — Moraines of 

 Southeastern South Dakota and their Attendant Deposits, J. E. Todd: Prelim- 

 inary Report on the Copper-bearing Rocks of Douglas County, Wis., U. S. 

 Grant: Bulletins of the Geological Survey of Finland. J. J. Sederholm and 

 Y. Hackjiann, 249. — Analyses of Rocks, Laboratory of the IT. S. Geological 

 Survey, 1880 to' 1899, F. W. Clarke, W. F. Hillebrand and H. N. Stokes: 

 Bjurbole, Finland, Meteorite, 250. 



Obituary— Professor G. H. F. Ulrich, F.G.S , 250. 



