It may be proper at this stage to point out that while, in the foregoing statement, a high birth-rate and a high marriage-rate have been regarded as practically the same thing, we need to make a distinction. The true relation of the two rates may be realized when it is stated that, the more primitive a community is, the more closely the two rates vary together. As a community becomes more civilized and more complex, the two rates tend to diverge; the restraints on child-production are deeper and more complex than those on marriage, so that the removal of the restraint on marriage by no means removes the restraint on fertility. They tend to diverge in opposite directions. Farr considered the marriage-rate among civilized peoples as a barometer of national prosperity. In former years, when corn was a great national product, the marriage-rate in England rose regularly as the price of wheat fell. Of recent years it has become very difficult to estimate exactly what economic factors affect the marriage-rate. It is believed by some that the marriage-rate rises or falls with the value of exports.[132] Udny Yule, however, in an expertly statistical study of the matter,[133] finds (in agreement with Hooker) that neither exports nor imports tally with the marriage-rate. He concludes that the movement of prices is a predominant--though by no means the sole--factor in the change of marriage-rates, a fall in prices producing a fall in the marriage-rates and also in the birth-rates, though he also thinks that pressure on the labour market has forced both rates lower than the course of prices would lead one to expect. In so far as these causes are concerned, Udny Yule states, the fall is quite normal and pessimistic views are misplaced. Udny Yule, however, appears to be by no means confident that his explanation covers a large part of the causation, and he admits that he cannot understand the rationale of the connection between marriage-rates and prices. The curves of the marriage-rates in many countries indicate a maximum about or shortly before, 1875, when the birth-rate also tended to reach a maximum, and another rise towards 1900, thus making the intermediate curve concave. There was, however, a large rise in money wages between 1860 and 1875, and the rise in the consuming power of the population has been continuous since 1850. Thus the factors favourable to a high marriage-rate must have risen from 1850 to a maximum about 1870-1875, and since then have fallen continuously. This statement, which Mr. Udny Yule emphasizes, certainly seems highly significant from our present point of view. It falls into line with the view here accepted, that the first result of a sudden access of prosperity is to produce a general orgy, a reckless and improvident haste to take advantage of the new prosperity, but that, as the effects of the orgy wear off, it necessarily gives place to new ideals, and to higher standards of life which lead to caution and prudence. Mr. N.A.