 Recently, an alternative technique for dealing generally with contradictions has emerged. Brown and Priest (2004) have proposed a technique they call “Chunk and Permeate”, in which reasoning from inconsistent premisses proceeds by separating the assumptions into consistent theories (chunks), deriving appropriate consequences, then passing (permeating) those consequences to a different chunk for further consequences to be derived. They suggest that Newton’s original reasoning in taking derivates in the calculus, was of this form. This is an interesting and novel approach, though it must meet the objection that to believe a conclusion obtained on this basis, one should believe all the premisses equally; and so an argument of the more common form, appealing to all the premisses without fragmenting them, should be eventually forthcoming. The objection is thus that Chunk and Permeate is part of the context of discovery rather than the context of justification.