Or again, difference in the marriage age in different classes within a given community has very notable consequences, as Sir Francis Galton showed in his book, "Hereditary Genius," and later, in more detail, in his "Inquiries into Human Faculty." He shows that, other things being equal, the earlier marrying class or group will in a few generations breed down the others and completely supplant them. If the natural quality of the one class differ from that of the other, the ultimate consequences will be tremendous. It has been proved up to the hilt that in Great Britain these differences in marriage in different classes exist, and that, on the whole, the marriage age varies directly as the means of support for the children, to say nothing of natural and transmissible differences in different classes. One can only, therefore, repeat what was said some time ago in contribution to a public discussion on this subject that, "considering the present distribution of the birth-rate, nothing strikes a more direct blow at the future of England than that which tends to increase the marriage age of the responsible, careful, and provident amongst us whilst the improvident and careless multiply as they do." Let us now consider another possible factor in this question, and then we must proceed to look at the individual woman as the question of the marriage age affects her. _The Marriage Age and the Quality of the Children._--Both from the point of view of the race and from that of the individual who desires happy parenthood it is necessary to learn, if possible, how the age of the parents affects the quality of their offspring. If motherhood is to be a joy and a blessing, the children must be such as bring joy and blessing. My provisional judgment on this matter is that we are at present without anything like conclusive evidence proving that the age of the parents affects the quality of their children.