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PROPOSE to give some account of a new theory of storms put forth by Prof. Blasius, of Philadelphia, formerly Professor of Natural Sciences in the Lyceum of Hanover, Germany. His attention was first drawn to the subject of storms in the year 1851. Having witnessed the destructive effects of a tornado at West Cambridge, Massachusetts, he made a careful survey of its entire track. The facts discovered about the middle of its course, where the most damage had been caused, favored the rotary theory of Redfield; those near the end of its path seemed to confirm the inblowing theory of Espy; but those at the beginning could not be explained by either theory. Discouraged and perplexed by these conflicting results, he resolved to apply to storms the analogy drawn from the life of an animal in its origin or embryo, its development to maturity, and its end. From this he argued that storms must have a beginning, a duration, and an end, with phases peculiar to each stage of their development and progress, like an animal; and, guided by this analogy, he made a careful reexamination and application of all the facts he had 