66 APPENDIX TO KEPOET OF THE SECRETARY. 



■which will give them the appearance of occupation. The Survey is in 

 possession of the data for the construction of many more models, and 

 they will be brought out as opportunity is given. They have also, in 

 connection with the views, multiplied many of the curious pieces of pot- 

 tery which have been brought back from that region by the various 

 parties connected with the Survey. 



Office iDorlc in 1877. — The early part of the year in the ofQce was 

 devoted to the completion of the Colorado work, and the latter part was 

 occupied in working up the summer's notes. 



During the summer, Mr. W. H. Holmes remained in the office, super- 

 intending the publication of the Atlas of Colorado, which is now rapidly 

 approaching completion. A large portion of the time was devoted by 

 him to the preparation of the " Economic Map," the "General Geological 

 Map," the "Geological Sections," and the "Panoramic Views." The fol- 

 lowing are the sheets included in the Atlas of Colorado : 



I. Triangulation Map. 

 II. General Drainage Map. 



III. Economic Map. 



IV. General Geological Map. 



V. Northwestern Colorado. XI. Northwestern Colorado. 



VI. Northern Central Colorado. XII. Northern Central Colorado. 



VII. Central Colorado. XIII. Central Colorado. 



VIII. Western Colorado. XIV. Western Colorado. 



IX. Southwestern Colorado. XV. Southwestern Colorado. 



X. Southern Central Colorado. XVI. Southern Central Colorado. 



XVII & XVIII. Geological Sections. 

 XIX & XX. Panoramic Views. 



Fiihlications. — Tbe year 1877 witnessed a marked increase in the num- 

 ber of publications of the Survey, no fewer than nine separate and formal 

 works having been issued. These are enumerated as follows: 



1. Catalogue of the publications of the Survey (second edition, revised 

 to December 31, 187G). 



2. The annual report for 1875, a large octavo of over 800 pages, fully 

 illustrated with plates, maps, and wood-cuts, giving the results of the 

 field-work of the year 1875, with an extensive appendix, consisting of 

 J. A. Allen's Memoir on the Buffalo, and A. S. Packard's Report on 

 Noxious and Beneficial Insects. 



3. A preliminary report of progress for the field-season of 1877, forming 

 part of the annual report of the Secretary of the Interior for 1877. The 

 full reports for the years 1876 and 1877 are in press, and will form two 

 large octavo volumes. 



4. Volume III of the "Bulletin" of the Survey, containing very nu- 

 merous articles in various departments of physical and biological science. 



5. The fourth edition of miscellaneous publications No. 1, being "Lists 



