Early Relations hcHvccn the United States and China. 9 



indispensable. A surprising number of these, most of them long 

 out of print, are to be found in nearly all of our large libraries. 

 A few periodicals are very useful. One especially, the Chinese 

 Repository, is an invaluable source. There are numerous biog- 

 raphies and memoirs, largely of missionaries, which cover this 

 period, and a number of secondary authorities can be found 

 which add useful information. Congressional documents and 

 other goAcrnment papers are of use, especially in tracing the 

 negotiations which resulted in the Treaty of Whanghia. 



