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should be given to this one. The plan which this committee hopes to carry out involves a constant watch of the comet, to be undertaken by a series of observers, so situated in latitude and longitude that the comet will never be lost sight of, except, of course, when it is in conjunction with the sun. A continuous series of photographs, taken in this way, on practically a uniform plan, will go far, it is hoped, toward the solution of some of the puzzling questions in connection with the physical behavior of these bodies, particularly with the rapid and peculiar change of the tail. The committee reports that good progress is being made towards carrying out their program. For the purpose of bridging the long interval between the Pacific coast and eastern Asia, Mr. Ellerman, of the Mount Wilson Observatory, expects to go to Honolulu early next spring.