purchaser therefore calculated not upon the value of the labour of his slave only, but, if a female, he regarded her as "the fruitful mother of an hundred more:" and many of these unfortunate people have there been in this state, whose descendants even in the compass of two or three generations have gone near to realize the calculation.--The great increase of slavery in the southern, in proportion to the northern states in the union, is therefore not attributable, _solely_, to the effect of sentiment, but to natural causes; as well as those considerations of profit, which have, perhaps, an equal influence over the conduct of mankind in general, in whatever country, or under whatever climate their destiny hath placed them. What else but considerations of this nature could have influenced the merchants of the freest nation, at that time in the world, to embark in so nefarious a traffic, as that of the human race, attended, as the African slave trade has been, with the most atrocious aggravations of cruelty, perfidy, and intrigues, the objects of which have been the perpetual fomentation of predatory and intestine wars? What, but similar considerations, could prevail on the government of the same country, even in these days, to patronize a commerce so diametrically opposite to the generally received maxims of that government. It is to the operation of these considerations in the parent country, not less than to their influence in the colonies, that the rise, increase, and continuance of slavery in those British colonies which now constitute united America, are to be attributed, as I shall endeavour to shew in the course of the present enquiry. It is now time to enquire into the nature of slavery, in general, and take a view of its consequences, and attendants in this commonwealth, in particular. [Footnote 4: Dr. Belknap's answers to St. G. T.'s queries.] [Footnote 5: Letter from Zephaniah Swift to St. G. T.]