as 151 on the square mile; Monmouthshire, which has 145;
or Northumberland, which has 108. The fecundity of Staffordshire,
which has more than 300 on the square mile, is as high as the average
fecundity of the counties which have from 150 to 200 on the square mile.
But, instead of confining ourselves to particular instances, we will try
masses.

Take the eight counties of England which stand together in Mr Sadler's
list, from Cumberland to Dorset inclusive. In these the population
is from 107 to 150 on the square mile. Compare with these the eight
counties from Berks to Durham inclusive, in which the population is from
175 to 200 on the square mile. Is the fecundity in the latter counties
smaller than in the former? On the contrary, the result stands thus:

The number of children to 100 marriages is--

In the eight counties of England, in which there are
from 107 to 146 people on the square mile............. 388

In the eight counties of England, in which there are
from 175 to 200 people on the square mile..............402

Take the six districts from the East Riding of York to the County of
Norfolk inclusive. Here the population is from 150 to 170 on the
square mile. To these oppose the six counties from Derby to Worcester
inclusive. The population is from 200 to 260. Here again we find that a
law, directly the reverse of that which Mr Sadler has laid down, appears
to regulate the fecundity of the inhabitants.

The number of children to 100 marriages is--

In the six counties in which there are from 150 to 170
people on the square mile................................392

In the six counties in which there are from 200 to 260
people on the square mile................................399

But we will make another experiment on Mr Sadler's tables, if possible
more decisive than any of those which we have hitherto made. We will
take the four largest divisions into which he has distributed the
English counties, and which follow each other in regular order. That
our readers may fully comprehend the nature of that packing by which his
theory is supported, we will set before them this part of his table.

(Here follows a table showing for population on a square mile the
proportion of births to 100 marriages, based on figures for the years
1810 to 1821.

100 to 150...396
150 to 200...390
200 to 250...388
250 to 300...378)

These averages look well, undoub