169. Difficulty of deriving a rule of universal jurisprudence on this
point from the practice of modern nations,
170. How in the law of nations in respect to slaves its reception of uni-
versal jurisprudence may be known,
171. Analogy probably found in the effect of Christianity upon the ear-
lier slavery of Europeans,
172. The question might be differently answered at different times dur-
ing the colonial period,
The question of the lawfulness of negro slavery in England consid-
ered as one arising under internal law.
180. Of the dictum, "in English air slaves cannot breathe," and a statute