 The implications of Crathorn’s atomism are truly astonishing. First, every movement boils down to local motion of atoms in the void. Thus, Crathorn affirms that a continuous motion has only one possible speed, which is the greatest speed it could ever reach (Murdoch 1984). In other words, movement is continuous when an atom changes from one atomic place to another contiguous atomic place. The proportion of time and place (i.e., the speed) is always equal to one. So how can he explain the fact that things appear to move at different speeds? The answer is quite simple: to every varying speed there corresponds a discontinuous motion, with times of rest between some of the atomic places occupied by the moving atoms (I Sent., q. 16, concl. 6). For example, the normal speed of an atom a corresponds to its local motion from a place p1 to another contiguous place p2 in a given atomic time. Variation of speed occurs if a moves from p1 to p2 but with a time of rest equivalent to two atoms of time. We may infer that speed can also vary if a goes from p1 to another place p3 that is not directly contiguous with p1.