LETTER OF TRANSMITTAL. 
Department of the Interior, 
United States Geological Survey, 
Washington, D. C, August 2, 1901. 
Sir: I have the honor to transmit herewith the manuscript for an 
Index to North American Geology, Palentology, Petrology, and Min- 
eralogy for the Years 1892-1900, inclusive, and to request that it be 
published as a bulletin of the Survey. It is a companion to Bulletin 
No. 188. 
Very respectfully, 
F. B. Weeks. 
Hon. Charles D. Walcott, 
Director Unitul Sluti* Geological Survey. 
