Sentence:  I speak from fifteen years' experience; five and thirty boys; American, Irish, English, German, African, Mulatto; not to speak of that <WSD>China boy</WSD> sent me by one who well knew my perplexities, from California; and that Lascar boy from Bombay. 
Meaning of the word marked with <WSD> tags:  A boy who is Chinese; a (young) man from China or of Chinese descent.