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neous material with a decrease of 935,429 cubic feet. Slight decreases were also recorded in the quantity of crossarms and piles treated.
" In 193o the quantity of creosote used by the wood-preserving industry was 213,9o4,421 gallons, or 5.9 per cent. less than was reported in 1929 . The amount of petroleum consumed by the industry was less in 193o than in 1929 by 1,555,865 gallons.
" The I93o consumption of zinc chloride by the treating plants of this country was less than that reported the year before by nearly 3o per cent. This reduction in the consumption of zinc chloride results in large part, perhaps, from the lessened use of this salt alone or in mixture with creosote in the treatment of cross-ties and switch ties. Consumption of zinc chloride in the treatment of other classes of material in 193o showed an increase over the quantity so used in 1929 .
" The total quantity of miscellaneous preservatives used by the wood preserving industry in I93O consisted of 1,77o,925 pounds of salts and 2o2,89I gallons of liquids. The salts comprised sodium fluoride, sodium arsenite, arsenic trioxide, zinc-meta-arsenite, sodium chloride, mercuric chloride and Wolman salts. The liquids included Ac-zol, Montan wax and Carbosota.
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