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Published online by Cambridge University Press: 15 September 2014
In the past two methods have been applied to the study of differential fertility. One may be called the absolute method, recently applied to Scottish data by the writer. The other may be called the comparative method, subsequently applied to the same statistics by Mr Barclay and Dr Kermack. Since the conclusions obtained by the two methods are not always consonant, it is important to evaluate the scope and reliability of each.