=Construction.=--It will hardly be necessary here to take up more individual cases. The almost universal use of trucks in the handling of materials of construction no doubt has affected the quantity and cost of construction, truly a productive process. Everyone is familiar with one or more of the many devices for loading and unloading, for in this class of haulage these things have reached a very high state of development. =Other Agencies.=--It is not the intention here to claim for the motor car entire credit for the manifold changes in marketing--buying and selling--which have occurred during the past two decades. Many other factors have entered into these changes and the corresponding advancement in the average standard of living. Transportation of all kinds, upon the highways, upon the railways, upon the waters, by telegraph, by telephone, by improvements in the postal service, and by the general increase in knowledge through the schools and printed literature, have all been instrumental in the development. But the automobile directly and indirectly has stimulated each of these activities and hence deserves credit with the rest. SELECTED REFERENCES Agricultural Inquiry, Report of Joint Commission on Part IV deals with Marketing, Washington, D. C., 1922. _American Forestry_, “Forest Fires,” Dec., 1920, p. 707. BOHM-BAWERK, “Positive Theory of Capital,” Translated by W. Smart, Books I-II. Macmillan & Co., London, 1891. BOYLE, JAMES E., “Speculation and the Chicago Board of Trade,” Macmillan Company, New York; “The Chicago Board of Trade, What it is and What it Does,” Distributed by the Chicago Board of Trade. COLLINS, J. H., “Motor Transportation for Rural Districts,” Bulletin 770 of the United States Department of Agriculture. COWAN, D. R. AND HART, F. C., “Motor Transportation in Rural Ontario,” Bulletin 227, Ontario Department of Agriculture, 1920. DANA, RICHARD T., “Hand Book of Construction Equipment,” pp. 550-559, 767-772. Firestone Ship by Truck Bureau, Akron: Bulletin No. 1, “Ship by Truck among Farmers through Coöperative Associations”; Bulletin No. 2, “How and Where to Establish Truck Routes”; Bulletin No. 3, “The Motor Truck at the Coal Mines”; Bulletin No. 4, “The Farmer and the Motor Truck”; Bulletin No. 5, “Costs and Their Relation to Truck Transportation.” Highway and Highway Transport Education Committee.--“Proceedings of a Conference on the Economics of Highway Transport, Held at the University of Maryland, July 27, 1921,” Washington, D. C. Kentucky, University of, College of Agriculture Circular No. 130, “Marketing Farm Products.” Lexington, Ky., June, 1922. LANE, F. VAN ZANT, “Motor Truck Transportation,” D. Van Nostrand Company, New York. National Automobile Chamber of Commerce, New York: “Facts and Figures of the Automobile Industry, 1921.” “Factors in Food Transportation.” “A State Endorses the Motor Express.”