v1 PREFACE. 
Publisher, not only for affording him every facility in the prosecution 
of his task, but for unwearied and invaluable assistance in the 
discharge of his editorial duties. He here also takes occasion to 
acknowledge his indebtedness to Mr. Wm. H. Smrru for revision of 
the proof-sheets and preparation of the Alphabetical Indexes; and 
also to Mr. Ropert Craieueap for the care which he has displayed 
in the typographical execution. 
S. F. Barrp 
Washington City, D. C., April, 1851. 
