the course of urban development-particularly of changes in social stratification. Whatever breaking points are used to distinguish occupational groups, the data offer some question as to the type of relationship that is involved. Throughout the years of fertility experience covered by the 1910 and 1940 data, the evidence suggests that it is more accurate to label the relation between fertility and socio-economic status as measured by occupation as one of inverse rather than of direct character. Neither label, however, does full justice to the facts. There was found, for example, considerable irregularity in the relative position of professionals, clerks, and proprietors on the scale of fertility used in this study. It is our belief that such instability of position within a narrow range is evidence that this is a relatively homogeneous group; that is, a group having the same general values and modes of living, and thus the same level of fertility. How, then, can this position be reconciled with the fact that clerks are not usually accorded the same socio-economic status as professional persons or proprietors? The solution of this problem may lie in distinguishing between values and status. Clerks in this sense might be classed with other white-collar groups since they tend to imitate their patterns of living. It is possible for clerks to have the same general attitudes and the same general style of living as professionals and proprietors, although unable to express this style of living and its associated attitudes on the same social and economic plane as the people whom they imitate. Instead of trying to measure status, therefore, and to correlate our indices of it with fertility, we should measure or delineate styles of living and show how their central values lead to the small-family pattern or to a continuation of the larger families typical of past generations. Occupations, when combined in broad classes as in this study, can serve as indices of general styles of living. Occupation to this degree may be said to be correlated with fertility.