The making of linen yarn and cloth, introduced in 1747, was successfully carried on for many years, and flax was locally grown. This industry received a severe check during the Great War (1793-1815), and gradually disappeared. The manufacture of straw-plait for bonnets and hats was begun about 1800, and fifteen years later the yearly export was valued at £20,000, from 6000 to 7000 women being employed in the industry. The material used was at first split ripened wheat straw; later, however, unripened, unsplit, boiled and bleached rye-straw was substituted. The reduction of the import duty on straw-plait finally destroyed this interesting home industry, of which Kirkwall and Stromness were the chief centres. The present-day industries of Orkney are unimportant. No minerals are worked in the county, although flagstone is quarried at Clestrain in Orphir, and red sandstone of fine quality at Fersness in Eday. The numerous sailing boats used in the Islands are mostly of home construction, the broad-beamed, shallow-draught, and comparatively light Orkney yawl being a type specially designed to suit local conditions of weather and tide. The making of the well-known Orkney straw-backed chairs is restricted by a very limited demand, and the specimens made for sale are somewhat more elaborate than those used in the cottages. A small quantity of home-spun tweed is made in the Islands, and a certain amount of rough knitting—stockings, mittens, and other articles used by the seafaring classes—is done in some districts. Fish-curing is carried on at Kirkwall, and to a small extent, as a home industry, in country districts. There are distilleries at Stromness, Scapa, and Highland Park, near Kirkwall, the output at the last-named being large, and in high esteem among whisky-blenders. 12. Fisheries and Fishing Station Of recent years Whitehall in Stronsay has become one of the great centres of the summer herring fishing, with an annual catch of from 80,000 to 90,000 crans, a total exceeded in Scotland only at the ports of Lerwick, Fraserburgh and Peterhead. As at many other places where this great industry is carried on, however, the boats, the capital, and the personnel come almost entirely from outside. There are smaller stations of this fishery at Kirkwall, Sanday, Stromness, Holm, and Burray, at the last-named of which alone the boats and crews are local.