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The reasonable character of these regulations, the feasibility of compliance on the part of the common carriers without undue expense, the degree of protec¬ tion that such compliance will afford to travelers and the relative simplicity of the routine tests that are recommended are sufficient evidence of the serious 1. King, C. E.: Studies on Blood and Urinary Amylase, Am. Jour. Physiol., 1914, xxxv, 301.doi:10.1001/jama.1914.02570260031023 fatcat:o7i6k2og6ff3pl6jgcr47xqob4