SummaryIt has been shown that the glyceride‐type composition of a natural fat can be calculated from the total mol per cent of saturated acids and the total mol per cent of trisaturated glycerides, in accord with a new rule of glyceride‐type distribution, which is stated as follows:The glyceride‐type composition of any natural fat is that obtained by interchange, according to chance, of one‐third of the saturated acids represented by the difference between the GS2 content required by chance and that actually present with the unsaturated acids in the fat, without allowing the formation of any further GS3.