 As mentioned above, the longer version of Burley’s De Puritate is thought to be largely a response to Ockham’s Summa Logicae, not exclusively but also with respect to consequence. Burley recovers the natural vs. accidental distinction which had been deliberately neglected by Ockham (Archambault 2018b), but in fact formulates it with a terminology similar to that used by Ockham for formal consequences, namely in terms of the concepts of intrinsic and extrinsic topics (rather than ‘middles’, but this appears to be above all a mere terminological difference):