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By Ronald Demos Lee

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The connection between father's age at death and son's age at marriage, or the possibility that the death of children will cause couples to increase their fertility. Historical demographers, in sum, need to go beyond data gathering and description. They must now begin to explore the range of possible relationships between the seemingly uncontrolled demographic behavior of individuals and the obvious structuring apparent in aggregate patterns. 16 APPENDIX The appendix consists of two tables on basic data beginning on the following page,and a list of the sources from which the data were taken.

J. Habakkuk (1955). George Homans (1941) used a similar version of the two models, stressing the relationship between impartible inheritance, stem families, emigration, celibacy, and late marriage. His arguments were supported by H. E. Hallam (1958), who showed that there were more young marriages and less emigration in a village with widespread partibility than in one where partibility was limited. The Irish case described in Arensberg and Kimball (1968) is a classic description of the stem family and its effect on demography.

Because the 3 lowest death months (June to August) slightly lag the peak in conceptions (April to July), one may infer that the peak summer months of conception were also months of relatively low pregnancy wastage. The intersection of the cycle of fertility and mortality is also apparent in the 9-month gap separating the months of highest mortality (January to April) from the peak months of conception. The negative correlations between the seasonality index and the monthly conceptions (column 5, Table 9) are not so marked in the trough as during the December to March interval.

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