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In fact, it has been found that, in solutions not exceeding five per cent., twice the amount of nitrate of silver dissolved in water gives three times the amount of chemical action; and this is true with other metals also in weak solution. It may be that this is not the precise expression of a physical law, but it agrees at least closely with the results of experiment.

The power arising from this action of two metals on a binary liquid may be carried to a distance and produce similar decompositions there. This is ordinary electrolysis. Metals have often been crystallized from their solutions in this way, and I have seen excellent preparations of crystalline silver, gold, tin, copper, platinum, etc., by using poles of the same metal as that intended to be deposited upon them. The forms thus obtained are precisely analogous to those produced by the simple immersion of one metal into a soluble salt of another, and illustrate still further the essential unity of the force that originates the two classes of phenomena.



UESTION (Chairman). I will ask you if you have any explanations you wish to offer on any point connected with the evidence which you gave on the last occasion?

Answer. Yes; I have to rectify some misapprehensions. From the restatement made by Mr. Farrar, it would appear that, in discussing the question of profits from republication of one of my works, I said I had "found that no other publisher would undertake the work without an additional profit of ten per cent.," which implies that I had endeavored to obtain another publisher. My meaning was, that I ascertained that any other publisher who thought of issuing a rival edition would expect to make a profit of ten per cent, beyond the ten per cent, commission for doing the business. Further, I have to remark that the case I took as illustrating the improbability that I should obtain any considerable compensation from increased sales under the royalty system was the case of one of my works only, the "Principles of Psychology," and in respect of this I may admit that there would be little danger of a rival