^{page 381 note 1} Cf. Wiener, Norbert, Cybernetics; or Control and Communication in the Animal and the Machine (New York, 1948)Google ScholarPubMed.

^{page 382 note 2} Excellent samples of changing census conceptions are contained in a recent monograph by Truesdell, Leon E., The Development of the Urban-Rural Classification in the United States: 1874–1949, Bureau of the Census, Series P-23, No. 1Google Scholar.

^{page 387 note 1} A moderate sized article, compressing much learning and reflection, lends itself readily to misinterpretation, as it is almost certain to contain ambiguities and seeming contradictions. A yet briefer comment readily exaggerates differences. I have stated my agreements and disagreements with Professor Spengler, however, without qualification, for the sake of forcefulness. For the sake of fairness, and as a caveat to the reader, I feel it important to note my own conviction that dissents and disagreements would probably be diminished, and in some cases dissipated, by extended debate.