"In the night I have seen a luminous cloud hover over a heliotrope on a side-table, break a sprig off, and carry the sprig to a lady; and on some occasions I have seen a similar luminous cloud visibly condense to the form of a hand and carry small objects about." These hands he claims to have frequently seen, sometimes in darkness, sometimes in light. On one occasion "a beautifully-formed small hand rose up from an opening in a dining-table and gave me a flower; it appeared and then disappeared three times at intervals: this occurred in the light, in my own room, while I was holding the medium's hands and feet." The hand often seemed to form from a luminous cloud. "It is not always a mere form, but sometimes appears perfectly life-like and graceful, the fingers moving, the flesh appearing as human as that of any in the room. At the wrist or arm it becomes hazy and fades off into a luminous cloud.... I have retained one of these hands in my own, firmly resolved not to let it escape. There was no struggle or effort made to get loose, but it gradually seemed to resolve itself into vapor, and faded in that manner from my grasp." We should not venture to quote these most remarkable statements but for the fact that they are made by a gentleman of such high standing for accuracy of observation, who knew perfectly well that he was imperilling his position in the scientific world and exposing himself to the contumely and accusation of loss of sanity that followed. In regard to this point it need only be said that his most valuable scientific work has been done since that period, and that his statements on scientific subjects are received everywhere to-day as unquestionably accurate and important. That he saw what he believed to be luminous hands there can be no doubt. Whether he was deceived is another question. As to the producing cause of these manifestations Professor Crooks offers no theory. Whether the power and the intelligence displayed came from some one present or from some disembodied spirit he makes no suggestion, but simply presents the facts as evidence that there are mysteries in nature transcending any that have yet been weighed and measured, and which must engage the attention of the science of the future. Of the other scientists named, Professor Wallace openly accepts the spiritualistic explanation of these phenomena. He has not, so far as we are aware, published any detailed statement of his investigations, though we have been told that they consisted in part in what is known as "spirit photography," or the taking of photographs of persons known to be dead, by his own private apparatus and in his own private rooms. As to the character of the results obtained by him, however, we are unable to make any statement.