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of an organ under the hand of a musician, it is sufficiently plain, for reasons already given, that we cannot wisely affirm this organ of the nervous system to be a hand-organ, whose tunes are pricked into its revolving barrels, and whose revolutions take place mechanically under external forces. Nor is it probable that the tune the pure thought and feeling lies open, like the music above the key-board; that the mind reads its own impressions in the molecular language of the cerebrum. In other words, it is not probable that thought as thought has any other than an instrumental, symbolic expression in the brain, such as it finds on a written page, or in spoken words.

The proof of our first proposition, that activity of brain always accompanies activity of mind, implies a close relation between the two. What is that relation? The brain on the one hand, is the recipient of definite impressions from the exterior world. These, offered in their last physical form as molecular charges, are not by the mind received in that form, but are translated into states of consciousness. These states give occasion to other more active states, which, with a similar subtile transfer, are accompanied by molecular changes, the agents of outgoing action. The word, articulation, offered to the eye or sounded in the ear,, carries a distinct change to the brain, which becomes to the' mind the occasion of an idea. On the other hand, the mind! having occasion through the presence of an idea to write or utter that word, initiates in the brain in a fixed way the needed action. This translation in either direction is am ultimate mystery, both of whose terms even the mind does not directly recognize. "Words are the counters of thoughts, and thought can not proceed far without them. But words are sustained in the mind passively or actively by one or other of these molecular occasions. When the mind, therefore, is thoughtful, those incipient: impressions, which are