[85] Thus, take the cautionary warning in the Report of Commission of Enquiry into Industrial Agreements (Great Britain) upon the proposal to make collective agreements entered into by joint industrial councils compulsory upon all enterprises engaged in the industry providing a certain majority (75 per cent. was the suggestion) of work people and employers in the industry or craft in question were represented in the council. "51--Attention has been drawn to the fact that, in the establishment of a scheme for dealing with proposals for extension of agreements, it would be necessary to provide for exceptions to be made in regard to individual firms or work people whose conditions of trade or employment were such as to differentiate them from the remainder of the trade to such an extent as to make the application of the agreement to them an inequitable proceeding." CD 6953, 1913, page 14. A bill embodying a clause providing for such a scheme for extension was proposed by the government in 1919 in return for certain concessions from the trade unions, but was withdrawn when the parliamentary labor leaders would not agree to the concessions. [86] P. S. Collier, Appendix VIII, 4th Report New York State Factory Investigating Commission, 1915, page 2113. [87] Much interesting material bearing on the question of district vs. national standardization is to be found in the report of the Commission on "Wages and Conditions of Employment in Agriculture" (Great Britain), 1919. An interesting bit of evidence was given by a farmer from Devonshire who was of the opinion "that the sticky nature of the ground in Essex induced a slow habit of moving, and he thought the Essex workmen did as much as could be expected in view of the labor involved in walking on wet land, during a large part of the year." Page 73. There is also much interesting material on the subject in the report of the Court of Inquiry into the "Wages and Conditions of Employment of Dock Labor" (Great Britain), 1920. The same problem has arisen, of course, many times in the course of trade union negotiations--for example, in the coal mines and railroads of the United States. [88] Section 12 (4), Trades Board Act, 1909, Restated in the Corn Production Act, 1917. [89] J. N. Stockett, Jr., "Arbitral Determination of Railway Wages," page 23. [90] J. N. Stockett, Jr., "The Arbitral Determination of Railway Wages," page 21. [91] See D. A. McCabe, "The Standard Rate in American Trade Unions," pages 82-91. [92] For example, see the recommendations of the Interstate Commission regarding classification of railroad employees. _U. S. Monthly Bulletin of Labor_, Nov., 1915. [93] Decision in Re Employees vs. Worthington Pump and Machinery Corp., Docket No. 163, National War Labor Board; see also decision in the Corn Products Case. [94] For a recent statistical study of the subject see an article by Ogburn and Kelley in the _Journal of the American Statistical Ass'n._ for September, 1916.