Bulletin of the Museum of Comparative Zoology 

 AT HARVARD COLLEGE. 



Vol. XXXVIII. 



GEOLOGICAL SERIES, Vol. V. No. 4. 



AN EXCURSION TO THE GRAND CANYON OF THE 

 COLORADO. 



Br W. M. Davis. 



With Two Plates. 



CAMBRIDGE, MASS., U.S.A.: 



PRINTED FOR THE MUSEUM. 



May, 1901. 



