IV ADVERTISEMENT. 



to the National Institute, of Washington, in 1844; and one by J. 

 R. McD. Irby, prepared for the Institution in September, 1878. 

 The material for this work has been collected and prepared for 

 publication by Mr. Wm. J. Rhees, Chief Clerk of the Institution. 



SPENOER P. BATED, 



Secretary Smithsonian Institution. 



Washington, D. C, October, 1879. 



