 All belief in the existence of other minds, Fechner reminds us, is based on analogy. We assume that other humans have minds because their speech and actions are like our own; and we infer that animals have minds because, in crucial respects, their actions are like our own. But we must be careful with analogy, Fechner warns, because we cannot demand that other creatures be exactly like ourselves in all respects. The very nature of analogy means that they are like us in some respects but unlike us in others. We are permitted to infer, because analogies do not exactly hold, that other creatures have minds similar to our own; but similarity does not mean identical or alike in all respects. Their minds could still be, in other respects, very different from our own. Though we assume that worms have souls, we recognize that they are very different ones from our own (Nanna: 6). Why cannot we then say that plants too have souls, though very different ones from us?