to constitute happiness. The modes of getting a livelihood arc also ludicrous, as e.g. maintenance by a king ; for he will have to be humoured : or by friends ; for friendship will then be purchasable for money : or living by wisdom ; for so wisdom will become mercenary.'' These are the objections urged against him. As the reputation of his writings stands so high, I have decided to make a separate catalogue of them, arranged according to the class of subject treated. And they are as follows : I. Logic. Logical Theses. The Philosopher's Inquiries. Dialectical Definitions addressed to Metrodorus, six books On the Terms used in Dialectic, addressed to Zeno, one book. Art of Dialectic, addressed to Aristagoras, one book. Probable Hypothetical Judgements, addressed to Dioscurides, four books. II. Logic dealing with the subject matter. First series : Of Judgements, one book. Of Judgements which are not Simple, one book. Of the Complex Judgement, addressed to Athenades, two books. Of Negative Judgements, addressed to Aristagoras, three books. Of Affirmative Judgements, addressed to Athenodorus, one book.