uld double their numbers
in twenty-five years. We may, we think, fairly calculate that, if the
female slaves had been as numerous as the males, and if no manumissions
had taken place, the census of the slave population would have exhibited
an increase of 32 per cent. in ten years.

If we are right in fixing on 32 per cent. as the rate at which the white
population of America increases by procreation in ten years, it will
follow that, during the last ten years of the eighteenth century, nearly
one-sixth of the increase was the effect of emigration; from 1800 to
1810, about one-ninth; and from 1810 to 1820, about one-seventeenth.
This is what we should have expected; for it is clear that, unless the
number of emigrants be constantly increasing, it must, as compared with
the resident population, be relatively decreasing. The number of persons
added to the population of the United States by emigration, between 1810
and 1820, would be nearly 120,000. From the data furnished by Mr Sadler
himself, we should be inclined to think that this would be a fair
estimate.

"Dr Seybert says, that the passengers to ten of the principal ports of
the United States, in the year 1817, amounted to 22,235; of whom 11,977
were from Great Britain and Ireland; 4164 from Germany and Holland; 1245
from France; 58 from Italy, 2901 from the British possessions in North
America; 1569 from the West Indies; and from all other countries, 321.
These, however, we may conclude, with the editor of Styles's Register,
were far short of the number that arrived."

We have not the honour of knowing either Dr Seybert or the editor of
Styles's Register. We cannot, therefore, decide on their respective
claims to our confidence so peremptorily as Mr Sadler thinks fit to do.
Nor can we agree to what Mr Sadler very gravely assigns as a reason for
disbelieving Dr Seyberts's testimony. "Such accounts," he says, "if not
wilfully exaggerated, must always fall short of the truth." It would be
a curious question of casuistry to determine what a man ought to do in a
case in which he cannot tell the truth except by being guilty of
wilful exaggeration. We will, however, suppose, with Mr Sadler, that Dr
Seybert, finding himself compelled to choose between two sins, preferred
telling a falsehood to exaggerating; and that he has consequently
underrated the number of emigrants. We will take it at double of the
Doctor's estimate, and suppose that, in 1817, 45,000 Europeans crossed