There is, however, some reason to believe that the diminution of disease and the prolongation of average human life are not necessarily or even generally accompanied by a corresponding improvement in general health. 'Acute diseases,' says an excellent judge, 'which are eminently fatal, prevail, on the contrary, in a population where the standard of health is high.... Thus a high rate of mortality may often be observed in a community where the number of persons affected with disease is small, and on the other hand general physical depression may concur with the prevalence of chronic maladies and yet be unattended with a great proportion of deaths.'[4] An anæmic population, free from severe illness, but living habitually at a low level of health and with the depressed spirits and feeble capacity of enjoyment which such a condition produces, is far from an ideal state, and there is much reason to fear that this type is an increasing one. Many things in modern life, among which ill-judged philanthropy and ill-judged legislation have no small part, contribute to produce it, but two causes probably dominate over all others. The one is to be found in sanitary science itself, which enables great numbers of constitutionally weak children who in other days would have died in infancy to grow up and marry and propagate a feeble offspring. The other is the steady movement of population from the country to the towns, which is one of the most conspicuous features of modern civilisation. These two influences inevitably and powerfully tend to depress the vitality of a nation, and by doing so to lower the level of animal spirits which is one of the most essential elements of happiness. Whether our improved standards of living and our much greater knowledge of sanitary conditions altogether counteract them is very doubtful.