To show the rapidity with which clippers were built, the ship _John Bertram_, of 1080 tons, was launched six weeks from the time her keel was laid, and in two weeks more was on her way from Boston for San Francisco with 1500 tons of cargo on board. When she was launched, her builder, Mr. Robert E. Jackson, fell overboard; her owner, Captain William T. Glidden, plunged after him, without even taking off his coat, and saved him. Old sailors predicted that she would be unlucky, yet she kept afloat thirty years afterward, and cleared her original cost a dozen times. [Illustration: A CLIPPER-BRIGANTINE.] In 1855 there were 268 ships of an average of 1200 tons each under our flag, and most of them were clippers. In addition to these there were many barks, brigs, and schooners remarkable for beauty of model and famous for speed. From 1849 to the breaking out of the civil war we had the cream of the carrying trade of the world. After that our shipping declined rapidly; many of our famous clippers were sold to avoid capture. Steam navigation has superseded sails in the China and Mediterranean trade, and to-day there are not a dozen clipper-ships left under our flag. When gold was discovered in Australia, the British purchased many of our fine clippers, which were very successful in their passages. The emigrants from British ports soon preferred them to their own vessels, on account of their spacious between-decks and high rate of speed. We also shared largely in the trade, and for several years kept regular lines of swift ships, laden with American goods, which found a ready market in Melbourne. After the adaptation of iron to ship-building, the British copied our clipper lines for most of their new sailing-vessels, and now compete successfully with us in carrying heavy cargoes. Iron ships have the preference in carrying grain from San Francisco to Europe. In 1813 a vessel from China received a pilot off Cape Cod in a fog, and kept close inshore to avoid two British frigates which were in the bay. When off Plymouth the fog lifted and revealed the frigates about two miles distant, which instantly made all sail in chase. It was only half-flood, and the pilot was afraid that there was not water enough to run in; but he took the chances and succeeded, though both vessels opened fire upon him. Fortunately there was a company of militia on hand with a field-piece, which protected the ship against the boats that were despatched to cut her out. All the men of the place turned out and soon landed her cargo, composed of teas and silks, and then stripped the ship to her lower masts, apprehensive that the boats might make a night attack on her. But they did not.