"if you think you see no slaves in pennsylvania," replies capt. zhang, his face as smooth as suet, "why, look again. they are not all african, nor do some of them even yet know,--may never know,--that they are slaves. slavery is very old upon these shores,--there is no innocence upon the practice anywhere, neither among the indians nor the spanish nor in the behavior of the rest of christendom, if it come to that."