The Napoleonic wars furnished the first opportunity of testing the truth of Franklin's assertion concerning the disastrous effect of armies on the race, by the collection of actual and precise data. But the significance of the data proved unexpectedly difficult to unravel, and most writers on the subject have been largely occupied in correcting the mistakes of their predecessors. Villerme in 1829 remarked that the long series of French wars up to 1815 must probably reduce the height of the French people, though he was unable to prove that this was so. Dufau in 1840 was in a better position to judge, and he pointed out in his _Traite de Statistique_ that, comparing 1816 and 1835, the number of young men exempted from the army had doubled in the interval, even though the regulation height had been lowered. This result, however, he held, was not so alarming as it might appear, and probably only temporary, for it was seemingly due to the fact that, in 1806 and the following years, the male population was called to arms in masses, even youths being accepted, so that a vast number of precocious marriages of often defective men took place. The result would only be terrible, Dufau believed, if prolonged; his results, however, were not altogether reliable, for he failed to note the proportion of men exempted to those examined. The question was investigated more thoroughly by Tschuriloff in 1876.[5] He came to the conclusion that the Napoleonic wars had no great influence on stature, since the regulation height was lowered in 1805, and abolished altogether for healthy men in 1811, and any defect of height in the next generation is speedily repaired. Tschuriloff agreed, however, that, though the influence of war in diminishing the height of the race is unimportant, the influence of war in increasing physical defects and infirmities in subsequent generations is a very different matter. He found that the physical deterioration of war manifested itself chiefly in the children born eight years afterwards, and therefore in the recruits twenty-eight years after the war. He regarded it as an undoubted fact that the French army of half a million men in 1809 increased by 3 per cent. the proportion of hereditarily infirm persons. He found, moreover, that the new-born of 1814, that is to say the military class of 1834, showed that infirmities had risen from 30 per cent. to 45.8 per cent., an increase of 50 per cent. Nor is the _status quo_ entirely brought back later on, for the bad heredity of the increased number of defectives tends to be still further propagated, even though in an attenuated form. As a matter of fact, Tschuriloff found that the proportion of exemptions from the army for infirmity increased enormously from 26 per cent. in 1816-17, to 38 per cent. in 1826-27, declining later to 34 per cent. in 1860-64, though he is careful to point out that this result must not be entirely ascribed to the reversed selection of wars.