our observation, analogous to already known laws:--"reduced facts lie behind us; speculative ones lie before us;" and without these latter science could make no progress. Faraday was only speculating when he said: "Thus either present elements are the true elements; or else there is the probability before us of obtaining some more high and general power of nature even than electricity; and which, at the same time, might reveal to us an entirely new grade of elements of matter, now hidden from our view and almost from our suspicion." Faraday's keen perception and acute practical judgment, were never better exemplified than in Keely's discovery of Negative Attraction; the laws governing which he is still researching; theorizing that it is the energy which controls the planetary masses in their advance toward each other, and in their recession from each other,--the energy which lifts the seas and the oceans out of their beds, and replaces them once in twenty-four hours; in other words, explaining the mystery of the action of gravity. Had Faraday lived longer he might have anticipated Keely in one of his discoveries; for he certainly was on the road to it, in the views of force and matter which he held that were not in accordance with the accepted views of his time; and which were then set aside as "wild speculations," by the physicists who complained of his "want of mathematical accuracy," of his "entertaining notions altogether distinct from the views generally held by men of science," who continued their experimental researches on their own lines.