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 time. No rabbits had lived in Australia until the English recently imported them, and no negroes lived in America until the slave-traders brought them here before the Revolutionary war, and on down until the abolition of the slave trade in the year 1808. From the first colonization of this country on down to the date of the abolition of the slave trade, only about 300,000 negroes were imported, and none have been brought to our shores since. They increase in a geometrical ratio. The mind does not readily conceive how this ratio, with such small beginnings, could so soon reach such large results. A single dollar loaned for twenty years on the stipulation that at the end of each year the sum was to be doubled, and so on, would require a payment of over a million of dollars for the last payment. Population, in obedience to this law, attains vast proportions within a single century.
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