Clarification of an ambiguity in Hull's Principles of Behavior

Corollary VII of the Principles is ambiguous in that the use of "coarse" and "fine" as descriptive of reinforcement delay ratios, is incompatible with earlier and later parts of the text. However, since a study by Anderson is cited as supporting the corollary, reference to the data resolves the ambiguity. A clarified version of the corollary is presented.