J. S. Mill reduced it to a formula: Two things resemble each other in one or more respects; a certain proposition is true of one; therefore it is true of the other.5 In legal analogies, we may have two cases which resemble each other in a great many properties, and we infer that some additional property in one will be found in the other.

Ruggero J. Aldisert, Agatha D. Aldisert, Logic for Lawyers- A Guide …, loc. 570