IV GEOLOGICAL AND GEOGRAPHICAL SURVEY. 



The four Bulletins of 1878 formed Volume TV, which maintained the 

 same high standard of excellence. 



Bulletins ISTos. 1, 2, 3 of 1879 and No. 4 of 1880 complete Volume V, 

 which is herewith offered to the public. 



The sixth volume having been ordered by the Department, the Bul- 

 letins will continue to be issued at convenient irregular intervals, as 

 material may come to hand ; the strictly serial character of the publica,- 

 tion being maintained. The actual date of issue is given on the tempo- 

 rary cover of each, as it is important to fix with precision the appear- 

 ance of the successive numbers of a periodical in which new genera and 

 species are described. 



This publication, answering fully the special purpose for which it was 

 established, is regarded as one of the most important means to the main 

 ends which the Survey has had in view. It has acquired a character 

 and standing which render it favorably comparable to the regular "Pro- 

 ceedings" or other similar publications of learned bodies of this country 

 or Europe. Its scope includes the whole range of the subjects for the in- 

 vestigation of which the Survey was conducted, and the appearance of 

 which in this connection has in no way interfered with the formal Ee- 

 ports of the Survey. The volumes already issued have contained arti- 

 cles upon Archaeology, Ethnography, Linguistics, Geology, Topography, 

 Geography, Palaeontology, and l^atural History in general, suitably 

 illustrated with plates, cuts, and maps ;. and no effort has been spared 

 to maintain a high standard of excellence. 



The thanks of the Survey are due to Dr. Elliott Coues, U. S. A., for 

 his careful and able conduct of the periodical. 



F. V. HAYDEN, 

 United States Geologist. 



