Report of the commissioner of patents, for the year 1849 (1850)
United States. Patent Office, Ewbank, Thomas, 1792-1870, Lincoln, Abraham, 1809-1865. Improved method of lifting vessels over shoals, United States. Congress (31st, 1st session : 1849-1850). House · Washington [D.C.] : Office of Printers to House of Reps. · leaf 621
nder the surface without suffocation,hence it is essential that they should have the power of rapid ascent and de-scent. The tail as well as the body of the porpoise, is adapted to great speed,and w^ith what ease a shoal approaches a ship from a distance, plays roundher, and disappears in the… … Fore and hind leg of a frog—half the natural size. Had we been acquainted with frogs only from geological casts, we shauldhave inferred their agility in water from the configaration of the hind feet, andthe long jointed rods that wield them. This tribe of batrachians has the repu ■tation of…
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