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Rh taking place, is pure superadded hypothesis, and metaphysical hypothesis at that, for we can frame no more notion of the details on the one alternative than on the other. Ask for any indication of the exact process either of transmission or of production, and Science confesses her imagination to be bankrupt. She has, so far, not the least glimmer of a conjecture or suggestion,—not even a bad verbal metaphor or pun to offer. Ignoramus, ignorabimus, is what most physiologists, in the words of one of their number, will say here. The production of such a thing as consciousness in the brain, they will reply with the late Berlin professor of physiology, is the absolute world-enigma,—something so paradoxical and abnormal as to be a stumbling block to Nature, and almost a self-contradiction. Into the mode of production of steam in a tea-kettle we have conjectural insight, for the terms that change are physically homogeneous one with another, and we can easily imagine