The inability to suckle acquires great significance if we realize that it is associated, probably in a large measure as a direct cause, with infantile mortality. The mortality of artificially-fed infants during the first year of life is seldom less than double that of the breast-fed, sometimes it is as much as three times that of the breast-fed, or even more; thus at Derby 51.7 per cent. of hand-fed infants die under the age of twelve months, but only 8.6 per cent. of breast-fed infants. Those who survive are by no means free from suffering. At the end of the first year they are found to weigh about 25 per cent. less than the breast-fed, and to be much shorter; they are more liable to tuberculosis and rickets, with all the evil results that flow from these diseases; and there is some reason to believe that the development of their teeth is injuriously affected. The degenerate character of the artificially-fed is well indicated by the fact that of 40,000 children who were brought for treatment to the Children's Hospital in Munich, 86 per cent. had been brought up by hand, and the few who had been suckled had usually only had the breast for a short time. The evil influence persists even up to adult life. In some parts of France where the wet-nurse industry flourishes so greatly that nearly all the children are brought up by hand, it has been found that the percentage of rejected conscripts is nearly double that for France generally. Corresponding results have been found by Friedjung in a large German athletic association. Among 155 members, 65 per cent. were found on inquiry to have been breast-fed as infants (for an average of six months); but among the best athletes the percentage of breast-fed rose to 72 per cent. (for an average period of nine or ten months), while for the group of 56 who stood lowest in athletic power the percentage of breast-fed fell to 57 (for an average of only three months).