Those who assume that, because we created an ample optical glass industry during the war, the United States is to be forever free of dependence upon foreign sources of this commodity, probably are too optimistic. There are numerous reasons why an optical glass industry is not likely to survive in the United States, at least on any large scale. The total normal American consumption of optical glass amounts to less than $1,000,000 a year--not enough to support many glass-making establishments. Secondly, nearly all the Allies developed war glass industries of their own, and the result is that the world has a large surplus of optical glass, which, if of good quality, does not deteriorate in storage. Thirdly, the war expansion of the world industry has created facilities above the present normal world requirements. In the fourth place, the industry is a precarious one, subject to heavy losses from carelessness or ineptitude in the mill. In the fifth, there is no tariff protection for American glass, the law permitting the free importation of precision optics for scientific purposes. Finally, there is a long-standing prejudice in favor of European-made scientific instruments, a prejudice against which an American industry would have to fight. Three American producers, however, are said to be making optical glass for their trade. In anticipation of a possible collapse of the industry, the Bureau of Standards has brought to Washington the glass-making facilities which it set up in a special war plant at Pittsburg. This plant can make two tons of optical glass a month. It is to be operated by the Government with the view both of improving processes and of creating within the Government an expert knowledge of this vital war industry. The United States carried further than any other nation in the war the substitution of mechanical power for the power of draft animals in the movement of field artillery. Nothing in our army equipment in France did the French, themselves the premier artillerists of the world, admire more than our motorization of artillery. The total contracts for ordnance vehicles represented an expenditure of $400,000,000. The program actually delivered 13,000 vehicles to the A. E. F., produced before the armistice an equal number ready for shipment abroad, and had 60,000 other vehicles under construction when the halt came. The Maxwell-Chalmers plant at Detroit and the Reo plant at Lansing, working in coöperation, were producing 1,100 5-ton tractors a month, and this production represented the military power of 12,000 draft animals and 4,000 men.