In respect to juvenile delinquency the most unenviable place is held by the native-born children of immigrants. They not only manifest two or three times as great a tendency toward crime as the native-born children of native parents, but they are much more criminal than foreign-born children. Of the juvenile delinquents committed during 1904, according to the census report, 76.7 per cent were native white. This percentage was made up as follows: native parentage, 37.6 per cent; foreign parentage, 24.9 per cent; mixed parentage, 9.7 percent; parentage unknown, 4.5 per cent. An exact comparison of the children of native parents and of foreign parents in this respect would require information as to the total number of the two classes in the country in the year in question, which is not available. But it cannot be supposed that the number of native-born children of foreign parents compared with the number of native-born children of native parents is anything like the ratio shown in the above figures. This high degree of criminality is attributed by Professor Commons and by the Immigration Commission largely to concentration in the cities. Whatever the cause, this tendency toward lawlessness among the second generation of immigrants is indisputable, and is one of the most disturbing elements in the whole situation.[303] Still another way in which the immigrant becomes a burden upon the American public is through insanity. The laws are very strict in regard to the admission of aliens who are liable to be subject to this misfortune. Yet it is impossible to prevent the entrance of large numbers who ultimately appear in the category of the insane. The maladaptation of the immigrant to his environment shows itself in this way perhaps as clearly as in any other. In the institutions for the insane, both public and private, in the United States, including Alaska, Hawaii, and Porto Rico, in 1908, there were, according to the Report of the Commissioner General of Immigration, 172,185 inmates. Of these 25,066 were aliens, 25,128 naturalized citizens, and 121,451 native-born. Thus the percentages were 70.5 per cent native-born and 29.5 per cent—nearly one third—foreign-born.[304] An even larger percentage of foreign-born appears among the insane persons enumerated in hospitals in continental United States on December 31, 1903—34.3 per cent of the white insane of known nativity[305]—while of the persons received at Bellevue and Allied Hospitals for treatment for insanity during the period of the investigation of the Immigration Commission, 63.4 per cent were foreign-born, and 36.6 per cent native-born. Moreover, among the native-born, more than half (20.6 per cent of the total) were native-born of foreign father.