Abstract
The data here discussed regarding the intraracial correlation between mamma number and size of litter in Duroc Jersey swine were furnished me by Professor E. N. Wentworth, formerly of the Iowa State College. I take this opportunity of expressing my appreciation of this kindness. The material was collected in the course of Professor Wentworth's studies on the inheritance of mamma number. 2 In the case of 13 out of the 57 dams recorded data are available for the size of two successive litters, namely those of 1911 and 1912. In these cases, in order to avoid unequally weighting the table because of the fertility of the dams, each dam has been entered in Table I once only, the litter size entered being the mean of the two successive litters.
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