130 BULLETIN 51, UNITED STATES NATIONAL MUSEUM. 



C. 40. Description of exhibit made by the department of prehistoric 

 anthropology in the National Museum at the Ohio Valley 

 and Central States Exposition in Cincinnati, Ohio, 1888. By 

 Thomas Wilson. 



8vo., 1888, pp. 1-33, 50 figs. 



C. 41. Guide to a collection illustrating the families of mammals, 

 exhibited in the Ohio Valley Centennial Exposition in 1888 

 by the U. S. National Museum. By Frederick W. True. 



Svo., 1888, pp. 1-26. 



C. 42. Circular relating to prehistoric anthropology. By Thomas 

 Wilson. 



8vo., 1888, pp. 1-16, 1 figs. 



C. 43. To the correspondents of the U. S. National Museum. By 

 G. Brown Goode. [With a view to securing accessions for 

 the library.] 



8vo., 1894, 1 page. 



C. 44. To the correspondents of the U. S. National Museum. By 

 G. Brown Goode. [With a view to securing publications for 

 the library in exchange.] 



8vo.,1894,'pp.l-8. 



C. 45. To the correspondents of the U. S. National Museum. By 

 G. Brown Goode. [With a view to securing authors' sepa- 

 rates and reprints for the library.] 



8vo., 1894, 1 page. 



C. 46. [Regarding the proposed revision of Bulletin 23, relating to the 

 flora of the District of Columbia.] By G. Brown Goode. 



8vo., 1895, 2 pp. 



C. 47. Circular in regard to the identification of specimens of mollusks 

 b}^ the National Museum. By G. Brown Goode. 



8vo., 1895, 2 pp. 



C. 48. Circular in regard to bones and teeth of the mastodon and 

 mammoth. By Frederic A. Lucas. 



8vo., 1897, pp. 1-4, 2 fig.s. 



C. 49. [Circular relating to the North American Violacea^.] By 

 Frederick W. True. 



8vo., 1899, 1 page. 



C. 50. [Circular transmitting questions relating to birds and birds' 

 eggs.] By Richard Rathbun. 



8vo., 1901, 3 pp. 



