In bis neiv work er.titled "The Constitution and Functions of Gases," S, J. Corrig-an, of gt. Paul, Mimn., ha,s alanced a new and intercsting theory of thr eonstitution of g-ases. Haretoforo it lias g-enerally been believed tnat the molecules of a g-as are in continual mo-' tion, and the pressure exerted by a ga is due to "bombardment" by millionsof, these paj-ticles. llr. Corrig-an' considers the molecule at rest, and compoeed of a larg-e number of atoms, vvhich; continuaUy describe orbits about itsi center witï great Telocitis. As the gis, becomes Tarer the "orbits" kicrease in size, and tlie pressure of the g-as is proportional to the angular velocity of the atoms m tíieirorbits.