To take a familiar example, and I can think of none better to show exactly the difference between a personal contract non-assignable, a document which is assignable, and one which is negotiable a Harvard-Yale foot-ball ticket. If the ticket is issued by the management to a person under his name, with a condition that it shall be used by no one else, it is a contract non-assignable.

When the name which is the subject of the proposition is a general name, we may intend to affirm or deny the predicate, either of all the things that the subject denotes, or only of some. When the predicate is affirmed or denied of all and each of the things denoted by the subject, the proposition is universal; when of some non-assignable portion of them only, it is particular.

This non-assignable and generally small increase of probability, beyond what would otherwise exist, is all the evidence which a conclusion can derive from analogy. For if we have the slightest reason to suppose any real connection between the two properties A and B, the argument is no longer one of analogy.