  There is something to be said for an appeal to scale invariance along the lines that laws that are shown to hold at the level of observation in a way that is independent of size should be held to hold generally, and in particular, on a scale so minute that it is beyond what can be observed. Boyle draws attention to the fact that the law of fall is obeyed by objects independently of their size and that the same appeal to mechanism can be applied alike to explain the workings of a large town clock and a tiny wristwatch (Stewart, 1979, 143). The question is to what extent recognition of scale invariance of this kind can aid the atomist. There is a range of reasons for concluding that it cannot.