Eudemus considered [Greek: e)/stin] as one term in the proposition. Alexander dissented from this, and regarded it as being only a copula between the terms, [Greek: sunthe/seôs mênutiko\n mo/rion tô=n e)n tê=| prota/sei o(/rôn.]] [Footnote 38: Aristot. De Interpr. p. 21, a. 32; compare Rhetorica, ii. p. 1402, a. 5. The remark of Aristotle seems to bear upon the doctrine laid down by Plato in the Sophistes, p. 258--the close of the long discussion which begins, p. 237, about [Greek: to\ mê\ o)/n], as Ammonius tells us in the Scholia, p. 112, b. 5, p. 129, b. 20, Br. Ammonius also alludes to the Republic; as if Plato had delivered the same doctrine in both; which is not the fact. See 'Plato and the Other Companions of Sokrates,' vol. II. ch. xxvii. pp. 447-458, seq.] Aristotle now discusses the so-called Modal Propositions--the Possible and the Necessary. What is the appropriate form of _Antiphasis_ in the case of such propositions, where _possible to be_, or _necessary to be_, is joined to the simple _is_. After a chapter of some length, he declares that the form of _Antiphasis_ suitable for the Simple proposition will not suit for a Modal proposition; and that in the latter the sign of negation must be annexed to the modal adjective--_possible_, _not possible_, _&c._ His reasoning here is not merely involved, but substantially incorrect; for, in truth, both in one and in the other, the sign of contradictory negation ought to be annexed to the copula.[39] From the _Antiphasis_ in Modals Aristotle proceeds to legitimate sequences admissible in such propositions, how far any one of them can be inferred from any other.[40] He sets out four tables, each containing four modal determinations interchangeable with each other. 1. 1. Possible (physically) to be. 2. Possible (logically) to be. 3. Not impossible to be. 4. Not necessary to be. 2. 1. Possible (physically) not to be. 2. Possible (logically) not to be. 3. Not impossible not to be. 4. Not necessary not to be. 3. 1. Not possible (physically) to be. 2. Not possible (logically) to be. 3. Impossible to be. 4. Necessary not to be. 4. 1. Not possible (physically) not to be. 2. Not possible (logically) not to be. 3. Impossible not to be. 4. Necessary to be.