 P. Kyle Stanford (1998), on the other hand, suggests that the analogy between real and nominal essences was intended to be based in their entailment relations. Stanford argues that, just as every property of a substance flows from the real essence with geometrical necessity (IV.vi.11), so too does every property of a triangle follow from its definition with geometrical necessity. And this fact is what all real and nominal essences have in common for Locke. By his way of thinking, even though the connection between the real essence of a piece of gold is the causal ground of the nominally essential properties of gold, and the real essence of a triangle is the logical ground for the nominally essential properties of a triangle, they are alike in that all nominally essential properties can be deduced from the idea of the real essence; if we knew the real essence of a triangle, then we could deduce from it any of the properties of a triangle. To make this analogy work, Stanford argues that the real essence of a substance is more than a corpuscular structure, it must also include the causal powers that produce the observable qualities of the substance; in like fashion, the real essence of modes includes the logical ground from which the nominally essential properties of the term flow. If Stanford is correct, then there is a possible analogy between the real and nominal essences of modes and substances that yields an interesting interpretation of the real essences of both modes and substances.