Thesis 9.1
Latin
Primum quod est necessarium in demonstratione non est quod diffiniuit Aristoteles primo Posteriorum, sed sic debet definiri: Primum est illud quod ita est uniuersalius subiecto, ut tamen de subiecti genere non praedicetur.
The 1486 apparatus retains a colon after 'definiri' (farmer1998:13796); the sheet's punctuation follows that reading.
English
The 'first' that demonstration requires is not what Aristotle defined in the first book of the Posterior Analytics; it should instead be defined this way: the first is what is more universal than the subject, yet is not predicated of the subject's genus.