I answer that, Tully, in his Rhetoric (De Invent.  Rhetor. i), gives seven circumstances, which are contained in this verse: 

“Quis, quid, ubi, quibus auxiliis, cur, quomodo, quando—­

“Who, what, where, by what aids, why, how, and when.”

For in acts we must take note of “who” did it, “by what aids” or “instruments” he did it, “what” he did, “where” he did it, “why” he did it, “how” and “when” he did it.  But Aristotle in Ethic. iii, 1 adds yet another, to wit, “about what,” which Tully includes in the circumstance “what.”

The reason of this enumeration may be set down as follows.  For a circumstance is described as something outside the substance of the act, and yet in a way touching it.  Now this happens in three ways:  first, inasmuch as it touches the act itself; secondly, inasmuch as it touches the cause of the act; thirdly, inasmuch as it touches the effect.  It touches the act itself, either by way of measure, as “time” and “place”; or by qualifying the act as the “mode of acting.”  It touches the effect when we consider “what” is done.  It touches the cause of the act, as to the final cause, by the circumstance “why”; as to the material cause, or object, in the circumstance “about what”; as to the principal efficient cause, in the circumstance “who”; and as to the instrumental efficient cause, in the circumstance “by what aids.”

Reply Obj. 1:  Time and place surround (circumstant) the act by way of measure; but the others surround the act by touching it in any other way, while they are extrinsic to the substance of the act.

Reply Obj. 2:  This mode “well” or “ill” is not a circumstance, but results from all the circumstances.  But the mode which refers to a quality of the act is a special circumstance; for instance, that a man walk fast or slowly; that he strike hard or gently, and so forth.

Reply Obj. 3:  A condition of the cause, on which the substance of the act depends, is not a circumstance; it must be an additional condition.  Thus, in regard to the object, it is not a circumstance of theft that the object is another’s property, for this belongs to the substance of the act; but that it be great or small.  And the same applies to the other circumstances which are considered in reference to the other causes.  For the end that specifies the act is not a circumstance, but some additional end.  Thus, that a valiant man act valiantly for the sake of the good of the virtue o[f] fortitude, is not a circumstance; but if he act valiantly for the sake of the delivery of the state, or of Christendom, or some such purpose.  The same is to be said with regard to the circumstance “what”; for that a man by pouring water on someone should happen to wash him, is not a circumstance of the washing; but that in doing so he give him a chill, or scald him; heal him or harm him, these are circumstances. ________________________

FOURTH ARTICLE [I-II, Q. 7, Art. 4]