"Like Kant before him, Darwin insists that the source of all error is semblance. Analogy, he says again and again, is always a ‘deceitful guide’ (see pp. 61, 66, 473). As against analogy, or as I would say merely metaphorical characterizations of the facts, Darwin wishes to make a case for the existence of real ‘affinities’ genealogically construed. The establishment of these affinities will permit him to postulate the linkage of all living things to all others by the ‘laws’ or ‘principles’ of genealogical descent, variation, and natural selection. These laws and principles are the formal elements in his mechanistic explanation of why creatures are arranged in families in a time series. But this explanation could not be offered as long as the data remained encoded in the linguistic modes of either metaphor or synecdoche, the modes of qualitative connection. As long as creatures are classified in terms of either semblance or essential unity, the realm of organic things must remain either a chaos of arbitrarily affirmed connectedness or a hierarchy of higher and lower forms. Science as Darwin understood it, however, cannot deal in the categories of the ‘higher’ and ‘lower’ any more than it can deal in the categories of the ‘normal’ and ‘monstrous.’ Everything must be entertained as what it manifestly seems to be. Nothing can be regarded as ‘surprising,’ any more than anything can be regarded as ‘miraculous.’"