In this paper, the author makes an attempt to apply the method of "Family Reconstitution"-bringing together the scattered information about the members of a family, the dates of baptisms, marriages and burials, in order to deduce the various demographic indices of a family-to a sample of families of a parish in the West Riding of Yorkshire and to investigate the relations between the demographic characteristics and the economic and social development. I. Long-term Trend of the population Growth in Yorkshire The nine-year moving averages of baptisms, marriages and burials of 7 rural parishes and 1 country town (Leeds) in Yorkshire over three hundred years have a good deal in common, showing the downward trends of baptisms during a century since the middle of the seventeenth century to the middle of the eighteenth century. II. Family reconstitution The basic data of Family Reconstitution are quoted from the register of Braithwell, registration of which is found to be more correct and complete, Various demographic indices deduced of this parish, such as the age at first marriage of women, rate of illegitimate child, mean birth interval, age-specific marital fertility and mean household size, seem to suggest a kind of family limitation during the period when the number of baptisms was decreasing. III. Migration of Population A rough estimate of the rate of migration of population can be made through the nominative analysis of the parish register. The result from the parish of Braithwell shows a lower degree of migration during the period of decreasing births. Other evidences of mobility of population, social and occupational, during this period show the same trend. IV. Population and Economic Development Some indices available of the economic activities in the West Riding since the Restoration to the eve of the Industrial Revolution indicate no signs of economic depression. It may be said, therefore, though with many qualifications for the present stage of the research, that the particular demographic characteristics which existed since the middle of the seventeenth century to the middle of the eighteenth century in this parish, such as the decrease of births, a kind of family limitation and a lower rate of mobility of population, should not have been brought about by the economic depression. People in this parish might neither have been forced to a resort to a limitation of population by the subsistent level of income due to the economic crisis nor should they have experienced 'la crise demographique'. A Plausible explanation for the characteristic demographic behaviour of the parishioners during this period requires a further research.
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