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glass will be, and the smaller in diameter. Tube is made in the same way as solid cane, with the difference that the mass of glass is blown into and expanded, before it is drawn out. Tube or cane is speedily rendered workable by the intense heat of the flame, and can be easily manipulated. The lamp-worker prepares from tube some of the most delicate apparatus used in scientific research, also a variety of goods for domestic and medical purposes. Cane is used in conjunction with tube for ornamental objects.     The first glass factory permanently established in the United States was in Brooklyn, N.Y., about 1754, and the first bottle made at this factory is still preserved among the curiosities of the Long Island Historical Society. Window glass was first manufactured at Pittsburg about 1795, and from this time the manufacture of glass steadily increased with the growth of the country, until in 1870 glass factories of every kind numbered about 200.     Since that time the business has developed rapidly, and now the value of the glass produced in this country is estimated at $25,000,000, while the factories number about 400.