  The foundational problem pushes the question about cohesion into the corpuscles themselves. The problem was raised by Joseph Glanvill: “If it be pretended…that the parts of solid bodies are held together by hooks, and angulous involutions; I say, this comes not home: For the coherence of the parts of these hooks…will be of as difficult a conception, as the former.”(Glanvill, The Vanity of Dogmatizing, p. 18, quoted in Hill 2004, p. 616) Without any grounds for asserting that the divisibility of matter bottoms out in indivisible corpuscles, then, the question arises of how the parts of a corpuscle could cohere, how the parts of those parts could cohere, and so on, ending in the question of how extended bodies are possible at all.