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Tae Marine Review 15 PILES EATEN BY TEREDOS. These pictures which were taken at Seattle, Oakland and San Francisco by Frank B. Gilbreth, of New York . . during the latter part of April shows creosoted piles that ANGLO-AMERICAN POLAR EXPEDITION. On the evening of May 20, the schooner Duchess of Bedford, set sail from Victoria, B. C., with the Anglo- are very badly eaten by teredos and limnoria and offer eas eres party on board, The lead oF the striking evidence of the necessity of concrete piles to expedition is Captain Ejnar Mikkelsen, a Dane, who has been a member of two previous Arctic exploring parties; SHOWING GENERAL EFFECT ON PILING, UNDERWATER CORROSION CAUSED BY WORMS, he is accompanied by Ernest de K. Leffingwell, a Chicago geologist, who was with Mikkelsen in the Baldwin ex- pedition; Ejnar Ditlevsen, a Danish Arctic explorer; George Howe, a Harvard zoologist; and a crew of seven men. Ernest Stefalssen, of Harvard, is already on his way to Herschel island, where he will be joined by the party on Augtist 20. The main object of the explorers is to discover the edge of the continental shelf and a chain of islands which, it is believed extend from Banks Land and 'Pat- rick island on the east, along the parallel of 76° to the longi- tude of Urangel island in Alaska. Ernest Stefalssen is a well-known ethnologist and Ejnar Ditlevsen, of Copen- hagen, is a naturalist. Both will make scientific obser- vations. Prof. George Davidson, of the United States coast sur- vey, president of the Geographical Society of the Pacific, -in his annual report points out that this region has been pretty well traversed by American whalers since the dis- covery of Urangel island by Captain Long in 1867, which was an unusually open season. Captain McKinnon, cruis- ing to the north of Point Barrow, reached 74° and had a sharp horizon extending in every direction. To the north he perceived the "loom of land" and would have pene- trated into higher latitude had not a shift of wind com- pelled him to return, through fear that a north wind might drive him into the ice-pack. The land sighted by McKin- non is marked on some maps. replace wooden structures. In the vicinity of Puget Sound according to Mr. Stewart, who is assistant chief en- gineer of the Great Northern railroad, a stick of timber, rough sawed, will last about eight months, a peeled pile PILING EATEN BY WORMS. will last a year, a pile with the bark on will last a year and a half while a creosoted pile will last from 15 months upwards, and the unfortunate part of it is that two piles treated and driven under the same conditions will be af- fected differently by the teredo and limnoria.