‘That in virtue of which’ has several meanings:-(1) the form or substance of each thing, e.g. that in virtue of which a man is good is the good itself, (2) the proximate subject in which it is the nature of an attribute to be found, e.g. colour in a surface. ‘That in virtue of which’, then, in the primary sense is the form, and in a secondary sense the matter of each thing and the proximate substratum of each.-In general ‘that in virtue of which’ will found in the same number of senses as ‘cause’; for we say indifferently (3) in virtue of what has he come?’ or ‘for what end has he come?’; and (4) in virtue of what has he inferred wrongly, or inferred?’ or ‘what is the cause of the inference, or of the wrong inference?’-Further (5) Kath’ d is used in reference to position, e.g. ‘at which he stands’ or ‘along which he walks; for all such phrases indicate place and positio............