LETTER OF TRANSMITTAL. 
Department of the Interior, 
United States Geological Survey, 
Washington, I). 6 T ., January 12, 1898. 
Sir: I have the honor to transmit herewith the manuscript of a 
catalogue of the Cretaceous and Tertiary plants of North America, and 
to request its publication as a bulletin of the Survey. 
Very respectfully, yours, 
F. H. Knowlton, 
Assistant Paleontologist. 
Hon. Charles I). Walcott, 
Director United States Geological Survey. 
