Note 13 — Front matter

There is a certain profit in studying one's own ancestry. It has been somewhat astonishing to me to find how very slight are the social oscillations traceable in a middle-class family and the families it intermarries with through several centuries. A professional family tends to form a caste marrying within that caste. An ambitious member of the family may marry a baronet's daughter, and another, less pretentious, a village tradesman's daughter; but the general level is maintained without rising or falling. Occasionally, it happens that the ambitious and energetic son of a prosperous master-craftsman becomes a professional man, marries into the professional caste, and founds a professional family; such a family seems to flourish for some three generations, and then suddenly fails and dies out in the male line, while the vigour of the female line is not impaired.