CONTENTS 
Bulletin No. 4' 
47. Analyses of Waters of the Yellowstone National Park, with an Account of the 
Methods of Analysis employed, by Frank Austin Gooch and James Edward Whitfield. 
Bulletin No. 48. * 
48. On the Porm and Position of the Sea Level, by Robert Simpson Woodward. 
Bulletin No. 49. 
49. Latitudes and Longitudes of Certain Points in Missouri, Kansas, and New 
Mexico, by Robert Simpson Woodward. 
Bulletin No. 50. 
50. Formulas and Tables to facilitate the Construction and Use of Maps, by Rob- 
ert Simpson Woodward. 
Bulletin No. 51. 
51. On Invertebrate Fossils from the Pacific Coast, by Charles Abiathar White. 
Bulletin No. 52. 
52. Subaerial Decay of Rocks and Origin of the Red Color of Certain Formations, 
by Israel Cook Russell. 
Bulletin No. 53. 
53. The Geology of Nantucket, by Nathaniel Southgate Shaler. 
Bulletin No. 54. 
54. A Report on the Thermo -Electrical Measurement of High Temperatures, by 
Carl Barus. 
HI 
