II.

The population of Cornwall is given for the years 1700 and 1750, at 105,800 and 135,000; but I know not on what authority. The years 1801, 1811, 1821, and 1831 are from the Parliamentary publications founded on the actual census on each occasion.

POPULATION OF CORNWALL.

In 1700 | In 1750 | In 1801 | In 1811 | In 1821 | In 1831 ――――――- | ――――――- | ――――――- | ――――――- | ――――――- | ――――――- 105,800 | 135,000 | 194,500 | 216,667 | 257,447 | 301,017

The per-centages of increase taken for 30 years, at the rate between each interval, are 15¾ per cent., 24 per cent., 38¼ per cent., 67¾ per cent., and 60 per cent.

At the rate of increase from 1700 to 1750, 1000 would become in a century 1628, and would double in 140 years. At the rate of increase from 1750 to 1801, 1000 would become in a century 2046, and would double in 96,8 years. At the rate of increase from 1801 to 1811, 1000 would become in a century 2943, and would double in 64,2 years. At the rate of increase from 1811 to 1821, 1000 would become in a century 5610, and would double in 40,2 years. At the rate of increase from 1821 to 1831, 1000 would become in a century 4776, and would double in 44,3 years.

The population of Cornwall being in 1831, according to the actual census, 301,017, if it continued to increase accordingly for a century at the rate ascertained between 1811 and 1821, the number of people in 1931 would amount to one million six hundred and eighty-eight thousand six hundred and fifty!

A Table exhibiting the amount to which the population of a thousand persons would amount in a century, and also the time of its doubling for each 5 per cent. of increase in 30 years, the period given for each parish from the Parliamentary Return.

――――――――――――――――――――――――――――――――――――――――+――――――――――――-+―――――――――――― A thousand, with the following increase,| Will become | Will double in thirty years | in a century| in ――――――――――――――――――――――――――――――――――――――――+――――――――――――-+―――――――――――― 5 per cent. increase in thirty years | 1176 | 426 years. 10 per cent. | 1374 | 218 15 per cent. | 1593 | 148 20 per cent. | 1836 | 114 25 per cent. | 2104 | 93,2 30 per cent. | 2398 | 79,2 35 per cent. | 2719 | 69,3 40 per cent. | 3070 | 61,8 45 per cent. | 3451 | 56 50 per cent. | 3863 | 51,3 55 per cent. | 4310 | 47,4 60 per cent. | 4791 | 44,2 65 per cent. | 5308 | 41,5 70 per cent. | 5874 | 39,2 75 per cent. | 6458 | 37,2 80 per cent. | 7094 | 35,4 85 per cent. | 7773 | 33,8 90 per cent. | 8495 | 32,4 95 per cent. | 9264 | 31,1 100 per cent. | 10080 | 30

APPENDIX.