(_α_) If indeed the form and only the form renders in some way visible this inward harmony and its necessity, it may be because we look upon this juxtaposition as the _habitual_ relation of such members, a connection which brings to our view some specific type and the oft-repeated formal exemplifications of such a type. But the necessity of custom is after all only a _subjective necessity._[229] According to such a principle we may find certain animals ugly for no other reason than that we find in them an organism which differs from our ordinary experience, or runs contrary to it. For this reason we call the organisms of certain animals bizarre in so far as the way in which their organs are related together is foreign to what is more common to our experience or entirely contradicts it. Fishes whose bodies are in size out of all proportion to their length of tail, or those in which we find eyes together on one side of the head only, are an example. In the world of plants we are already prepared to find many such strange departures from type, although the cactus with its spines, and the more rectilinear shaping of its angular junctures[230] may still arouse our wonder. The more a man is educated, however, in all branches of natural history, the more able he will be to recognize in their truth the subordination of all parts of organic life, and carry in the memory the greatest variety of types in their proper classification, and the less anything he may observe will surprise him.