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i don't know that the Arab and black slave-dealers dressed their forceable possessions with the language of the common law, as contrasted with the agriculuralist slave-buyers in british north america for whose demands the slaves were captured and transported

their titles to first generation slaves were acquired by purchase, and to succeeding generations by the law of increase

the titles lasted as long as the relevant political community consented to what has been called a 'peculiar institution' ---- one which is revealing on the connections between lawyers' property law and the social context