CHANGE OF SHAPE • E-FREE TRANSLATION.COM • Definition of Change of shape

... commenting on the theory of Mr. Redfield before the British Association, convened at Newcastle in 1838,[35] suggested an analogy to terrestrial hurricanes, from a suspected rotation and progressive motion in these spots. From their rapid formation, change of shape, and diameter, this view is allowable, and, taken in conjunction with the action of the ethereal currents, will account for all the phenomena. The nucleus of the spot is dense, like the nucleus of a storm on the earth, and surrounded by a penumbon precisely as our storms are fringed with ...

— Outlines of a Mechanical Theory of Storms - Containing the True Law of Lunar Influence • T. Bassnett