Fig. 2.—Relative and absolute numbers of prisoners in the United States from 1850 to 1904.

England's "defective" classes during the 22 years between 1874 and 1896 increased from 5.4 to 11.6 per thousand of the total; that is, more than doubled in that brief period. Rentoul has collected careful information regarding the number of insane or mentally defective and degenerate in Great Britain. In England the number of "officially certified" insane, which is far less than the actual number, increased from one to every 319 of the total population, to one to 285, in the nine years preceding 1905. In Ireland comparison of the years 1851 and 1896—a period of 45 years intervening—shows an increase in the corresponding ratio from 1:657 to 1:178. The census of 1901 showed in Great Britain 484,507 mental defectives of all kinds; this is one to 85 of the total population, and probably if the whole truth were known the ratio would approximate 1:50, according to Rentoul's calculation. The ratio of known insane just doubled in the decade preceding 1901. The Scottish Commission reports an increase in insane of 190 per cent since 1858, the total population increasing meanwhile by only 52 per cent.

The worst side of these British statistics follows. In 1901, of the 60,000 and more, idiots, imbeciles, and feeble-minded, nearly 19,000—roughly one third—were married and free to multiply; and as for that matter a great many of those unmarried are known to have been prolific. In 1901, of the 117,000 lunatics, nearly 47,000—considerably more than one third—were married. 65,700 idiots and lunatics legally multiplying their kind and worse! Rentoul rightly says: "The hand that wrecks the cradle wrecks the nation."

In the United States the census of 1880 reported 40,942 insane in hospitals, and 51,017 not in hospitals—a total of 91,959 known insane. In 1903 the number in hospitals had increased to 150,151. The number not in hospitals was not given and cannot be determined accurately, but it is conservatively estimated as certainly not less than 30,000, and probably it is far greater than this. In many states it is known that about one fourth of the insane are not in hospitals. But taking the total of 180,000 as a conservative figure, the ratio of known insane in the total population was 225 per 100,000 in 1903 as compared with 183 per 100,000 in 1880.

The methods of the collection of such data vary in different countries so that the results are not comparable. In a single country there is less, though still some, lack of uniformity, so that the exact rate of increase in the ratio of the insane is still somewhat doubtful. Moreover, it is doubtless true that some of this apparent increase results from improved methods in the collection of data, and from more complete registration of these defectives. But suppose we disregard entirely the idea of an increase in the ratio of these defectives, the bare fact of the existence of nearly 200,000 insane in this country is sufficiently alarming; and it is disgraceful to any nation, because it is unnecessary. The Superintendent of the Ohio Institution for the Feeble Minded wrote in 1902: "Unless preventive measures against the progressive increase of the defective classes are adopted, such a calamity as the gradual eclipse, slow decay and final disintegration of our present form of society and government is not only possible, but probable."

The latest census reports for the United States give data relative to the dependents and defectives in institutions. The numbers not in institutions can only be guessed at. But from the available sources we can gain an approximate conception of the numbers in our country to-day as follows:—insane and feeble minded, at least 200,000; blind, 100,000; deaf, and deaf and dumb, 100,000; paupers in institutions, 80,000, two thirds of whom have children, and are also physically or mentally deficient, and to say that one half of the whole number of paupers are in institutions is to give a ridiculously low estimate; prisoners, 100,000, and several hundred thousand more that should be prisoners; juvenile delinquents, 23,000 in institutions; the number cared for by hospitals, dispensaries, "homes" of various kinds, in the year 1904 was in excess of 2,000,000. From these figures we get a rough total of nearly 3,000,000. Must we define a civilized and enlightened nation as one in which only one person in every thirty can be classed as defective or dependent?

It is needless to continue descriptions of this kind. The foregoing are representative data; they are published by the volume. It is always the same story—rapid increase of the unfit, defective, insane, criminal; slow increase, even decrease of the fit, normal, or gifted stocks. It is with such conditions in mind that Whetham writes: "Although this suppression of the best blood of the country is a new disease in modern Europe, it is an old story in the history of nations and has been the prelude to the ruin of states and the decline and fall of empires."

The ultimate aim of Sociology is doubtless the working out of the laws according to which stable communities are formed and maintained, and in which each component individual may enjoy and contribute the maximum of pleasure and profit. So the primary purpose of Statecraft is to produce a nation which shall be stable and enduring. This is all familiar ground. The objects of the nation's immediate activities and concern, protection from enemy, development of commerce and manufacture, agriculture, and education, all these are for the real purpose of establishing and promoting national integrity. No nation exists long without ideals and traditions, without teachers, artists, poets, and yet the primary condition of the existence of all these is a great body of citizens characterized by physical and mental soundness—vigor and sanity. In searching for guiding principles in their great endeavors the sociologist and statesman have sought aid from many sources. But, as Pearson points out, Philosophy has thus far given no law by the aid of which we can understand how a nation becomes physically and mentally vigorous. Anthropology has done little to show wherein exists human fitness as a social organism. Political Economists object that they are not listened to with respectful consideration in legislative chambers. History is the favorite hunting ground of the statesman searching for guidance; but unfortunately history teaches chiefly by example and analogy, rarely by true explanation. And just as some gifted persons are able to give an apt Biblical quotation touching any occurrence whatever, so, many statesmen can cite some historical analogue which they offer as evidence for their views, whatever they are. These men are sincere, in their ignorance of the nature of scientific proof. Finally, although the Statesman still holds rather aloof, the Sociologist comes now to the Biologist, inquiring whether by any chance he may be in possession of data or guiding principles which may be somehow of service in the building of stable societies. The Biologist does not send him away without contribution. The Sociologist makes known his needs, the Biologist displays his possessions, and it is at once evident to both that they have much in common, and that each is able to supply the other with some needed wares. Each may learn from the other; and best of all, the Biologist seems to have information which can be of the greatest service in their common work of building sound societies.

And the biologist is grateful to the sociologist for reminding him that he, too, has sacred duties in this direction. He is too often forgetful that the real aim of his own, as of any science, is to be useful in real human life. It is pleasing to the biologist to feel that he is at last in possession of facts of value to the student of human society, for to him his debt is great. From the sociologist he has drawn the inspirations which have led to some of his greatest discoveries. It was Malthus who suggested to Darwin the great principle of the struggle for existence among men which Darwin so successfully applied to other organisms, and used so profitably in building up his great theory of natural selection. It was from the sociologist that the biologist derived his idea of the physiological division of labor which has proved so fruitful a conception; and from the same source he has drawn many of his conceptions of organic individuality.