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sharing the two natures disappeared; the separation of the two fields, though often carried to a mistaken extent, became decisive. Thus the way was prepared for sound investigation in both directions.

The second point is the states of mind incident to the organic action of the senses. The content of the sense in each instance, with its definite, discriminated qualities, in some way controls the mind, and the mind in active, constructive fashion responds to this external efficiency. If any physical force acts upon a body in reference to it inert, it is yet true that the result will turn quite as much on the qualities of the so-called passive agent as on those of the aggressive one. Every agent, physical and mental, ceases to be passive under action, and blends in the results its own activities with those of the efficient cause. We may forget this in mechanical facts, we can scarcely forget it in chemical, vital, mental facts. The mind is barely less active in a sensation than in a perception, in a feeling, than in a thought. Each is determined as a conscious state by a susceptibility called out, or a power occupied. As regards the fact of activity, the two classes are not separable, though the activity in perception and thought is more voluntary, more modifiable than that in sensation and feeling. The mind, as possessed of a definite constitution, determines the nature and efficiency of each of its states. If the mind is restricted to organic conditions for particular sensations, so are these conditions, in turn, restricted to answering susceptibilities before they pass into mental facts. Nothing but a living agent can feel. When oxygen and hydrogen combine, there are conjoint activities, conjoint properties, conjoint products.

The activity of the mind in sensation is shown not merely by the fact that sensibility is activity, but by the fact that the mind is ever interpreting and attributing its