20 INTRODUCTORY LETTER. 



desired, and to their courtesy and uniform kindness nnicli of the snoross of 

 the natural history operations is attributable. 



In the special work of preparing the reports relative to its collections, 

 the expedition is under obligations to a number of distinguished scientists 

 for their kind and gratuitous services in the work of identification of the 

 individual specimens. Tlie following are among the large nundjer of the 

 gentlemen in question: 



■ In the determination of — 

 Birds, Prof S. F. Baird; Dr. Elliott Cones, U. S. A.; Mr. Robert Ridg- 

 way, of the Smithsonian; Prof J. A. Allen; Mr. George N. Lawrence, of 

 the Lyceum of Natural History of New York; ^Ir. C. Hart MeiTiam, of 

 the Yale Scientific School; Dr. Thomas Brewer, of Boston; Mr. William 

 Brewster, of Cambridge; Mr. Charles E.Aiken, of Colorado; and Capt. C. 

 Bendire,- U. S. A. 



I have the honor to be, very respectfully, your obedient serv'ant, 



II. C. Yarrow, 

 Actinff Assistant Surficon United States Army. 



First Lieut. Gkokge M. Wheeler, 



Corps of Engineers United States Army, in charge. 



