654 J. V. LEWIS ORIGIN OF PILLOW LAVAS 



George Otis Smith, Director of the United States Geological Survey, 

 for valuable assistance from the Survey library and for access to the 

 proof-sheets and manuscripts of unpublished reports; to Dr. Henry B. 

 Kiimmel, State Geologist of Xew Jersey, for permission to use the ma- 

 terials and results of investigations that have been made for the State 

 Survey; to Prof. William H. Hobbs, of the University of Michigan, and 

 to Dr. F. L. Eansome, of the United States Geological Survey, for the 

 loan of photographs and for assistance in the search for literature; to 

 Prof. B. K. Emerson, of Amherst College, for the use of one of his illus- 

 trations. I have also had important assistance in locating the literature 

 of the subject from Mr. Bernard Hobson, F. G. S., of Sheffield, England. 



