“Your incident is a typical example of cerebral induction from a source containing stored cerebricity. I use this word, not to be found in my dictionaries, as expressing the brain-cell power corresponding to electricity. Think how long it was before we had attained any real conception of the laws that govern the wonderful agent, which now works in harness with the other trained and subdued forces! It is natural that cerebricity should be the last of the unweighable agencies to be understood. The human eye had seen heaven and earth and all that in them is before it saw itself as our instruments enable us to see it. This fact of yours, which seems so strange to you, belongs to a great series of similar facts familiarly known now to many persons, and before long to be recognized as generally as those relating to the electric telegraph and the slaving `dynamo.' “What! you cannot conceive of a charge of cerebricity fastening itself on a letter-sheet and clinging to it for weeks, while it was shuffling about in mail-bags, rolling over the ocean, and shaken up in railroad cars? And yet the odor of a grain of musk will hang round a note or a dress for a lifetime. Do you not remember what Professor Silliman says, in that pleasant journal of his, about the little ebony cabinet which Mary, Queen of Scots, brought with her from France,--how 'its drawers still exhale the sweetest perfumes'? If they could hold their sweetness for more than two hundred years, why should not a written page retain for a week or a month the equally mysterious effluence poured over it from the thinking marrow, and diffuse its vibrations to another excitable nervous centre?”