The investigation of the recks miles under the sea seems impossible, but Mr, Owing has recently shown that it may be done, His methods are being applied off the English coast by E. C. Bullard and T. F. Gaskell, who have reported some preliminary results in "Nature," The Admiralty surveying ship Jason laid instrument ior recording earthquake waves various points along a line extending 170 miles from the Lizard. All of ihe instruments were connected to the ship, so that their records of incoming waves could be watched simultaneously. At some distance from the line charges ce about 60lb. of T.N.T. were lowered to the bottom from a motor-boat and exploded.
Deductions about the compo: and structure of the submarine rocks may be made from the di of time taken by the waves to reach the ments. It has been found that the upper submarine rocks near the Lizard are 1,000 feet thick and are not granite. t th Chanifel i geological formation but dəveloped along the line of a pre-existing basin, Nor is the rock under 170 miles troy these forests and did not regenerate them. When the trees had gone the streams turned into fitful torrents and gradually washed the soil down to the plains, where it silted the rivers. This reduced their ced of flow, which was followed by the spread of malarious swamps and the obstruction of harbours. Farming land was destroyed, and with it the, agricultural population from which the early and vigorous republics hed recruited their armies. The same erosive forces are destroying large parts of the United States, but all the resources of science and engineering are now being used against them. One of the most effective is the planting of kudzu, a creeping leguminous plant which checks the flow of water and binds the soil together, and also replenishes it with nitrogen.
Text read from the printed page and cleaned; old type leaves the occasional error.