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However visionary this idea might be, he had collected innumerable and extremely interesting data, having examined the anatomical structure of almost every winged thing in the creation, and compared the weight of the body with the area of the wings when expanded in the act of volitation as well as the natural habits of birds, insects, bats, and fishes, with reference to their powers of flying and duration of flight.

A chimney-sweeper observed to a scientific friend that probably the density of the atmosphere might prevent the intended volitation; and Popanilla, who, having read almost as many pamphlets as the observer, now felt quite at home, exceedingly admired the observation.