The Siberian Meteor of June 30, 1908.—The Scientific American for April contains a note by J. G. Crowther on the above meteor, which is undoubtedly the most remarkable one on record. It will be remembered that many square miles of forest were levelled, thousands of reindeer killed, and that a blast of hot air was felt by people at a considerable distance from the fall. Mr. Crowther now reproduces barographs taken on that day at five stations in England; they all show a series of well-marked oscillations, at times that get later as they are farther from the place of the fall. The deduced velocity is about that of sound, and the time of travel from Siberia to England is 5 hr. 10 min., which is about right for a sound journey of 3550 miles. Hence there is little doubt that the oscillations indicate air-waves produced by the fall.