the south-east part of the state, but it is quarried chiefly in Knox county. As its colour--blue and blue-black streaked with white--renders it undesirable for building purposes, nearly all of it is burned into lime, which has become a very important article of manufacture in the city of Rockland; the industry dates back to 1733 in Knox county. In 1907 the quantity of lime burned in Maine was 159,494 tons and its value was $747,947. Slate is quarried chiefly in Piscataquis county, most of it being used for roofing, but some for blackboards; in 1907 the amount quarried in Maine was valued at $236,106. About 1896 some remarkably white and pure feldspar began to be quarried in Androscoggin, Oxford and Sagadahoc counties, but afterwards the spar mined in Maine was of less excellent quality; in 1907 the production in Maine was valued at $157,334, the total for the entire country being $499,069. Clay is obtained in various places, and in 1905 the total value of the clay products was $619,294. In Oxford county tourmaline, spodumene (or kunzite) and beryl occur, the tourmaline crystals being notably large and beautiful. Mineral water occurs in many localities, particularly in Androscoggin, York, Cumberland and Oxford counties; the most famous springs are the Poland Springs in Androscoggin county. Most of the mineral waters bottled in the state are chalybeate and slightly alkaline--saline; their average temperature is about 43°. In 1908 27 springs were reported, their aggregate sales amounting to 1,182,322 gallons. Copper, gold alloyed with platinum, iron ore, barytes, graphite and lead occur in small quantities in the state. In 1908 the total mineral product of the state was valued at $7,044,678.