28 
APPENDIX C. 
Although this report does not present a full exposition of the natural history of the regions 
traversed, we believe that it will be found that but few objects of interest have ever been 
discovered in Washington Territory which we have omitted. 
Of the numerous excellent plates accompanying, we need only say, that they were prepared 
by the most eminent artists, under the direction of the gentlemen above named, and mostly in 
the Smithsonian Institution. 
By combining our materials, we have been enabled to reduce the space very materially; and 
had we been present when the first chapters were prepared, could have presented them in a 
more condensed form. 
For the very complete article on the insects collected on the survey which precedes our 
reports, the entire credit is due to Dr. John L. Leconte, of Philadelphia. 
With sentiments of respect and esteem, we remain your most obedient servants, 
J. Gr. COOPER, M. D. 
GEO. SUCKLEY, M. D. 
Hon. I. I. Stevens. 
