joined with shape . For every quality changes, but the atoms do nnt change, since, when the composite bodies are dissolved, there must needs be a permanent something, solid and indissoluble, left behind, which makes change possible : not changes into or from the non-existent, but often through differences ofarrangenii nt. and sometimes through additions and subtractions of the atoms. & Hence these somethings capable of being diversely arranged must be indestructible, exempt from change, but possessed each of its own distinctive mass c and configuration. This must remain. •• For in the case of changes of configuration within our experience the figure is supposed to be inherent when other qualities are stripped off, but the qualities are not supposed, like the shape which is left behind, to inhere in the subject of change, but to vanish altogether from the body. Thus, then, what is left behind is sufficient to account for the differences in composite bodies, since something at least must necessarily be left remaining and be immune from annihilation. " Again, you should not suppose that the atoms have any and every size, d lest you be contradicted by fact- : but differences of size must be admitted ; for this addition renders the facts of feeling and sensation easier of explanation. But to attribute any and to the motion of the component atoms. With eV iro\\ol$ understand aTepeuviois : the arrangement of the atoms varies in solid objects. ' In § 53 Hyxoi was translated " particle," since the context shows that a group of atoms analogous to a visible film is meant. But here each of the permanent somethings, i.e. the atoms, has its own mass (oyKos) and configuration. d The opinion of Democritus.