[61] The experiments at the Stevens Institute, Hoboken, were reported by Peirce to the Permanent Commission which met in Hamburg, September 4-8, 1878, and his report was published in the general _Bericht_ for 1878 in the _Verhandlungen der vom 4 bis 8 September 1878 in Hamburg Vereinigten Permanenten Commission der Europäischen Gradmessung_ (Berlin, 1879), pp. 116-120. Assistant J. E. Hilgard attended for the U.S. Coast and Geodetic Survey. The experiments are described in detail in C. S. PEIRCE, "On the Flexure of Pendulum Supports," _Report of the Superintendent of the U.S. Coast and Geodetic Survey for 1880-81_ (Washington, 1883), app. no. 14, pp. 359-441. [62] _Verhandlungen der vom 5 bis 10 Oktober 1876 in Brussels Vereinigten Permanenten Commission der Europäischen Gradmessung_ (Berlin, 1877). See report of third session, October 7, 1876. [63] _Verhandlungen der vom 27 September bis 2 Oktober 1877 zu Stuttgart abgehaltenen fünften allgemeinen Conferenz der Europäischen Gradmessung_ (Berlin, 1878). [64] _Verhandlung der vom 16 bis 20 September 1879 in Genf Vereinigten Permanenten Commission der Europäischen Gradmessung_ (Berlin, 1880). [65] _Assistants' Reports, U.S. Coast and Geodetic Survey, 1879-80._ Peirce's paper was published in the _American Journal of Science_ (1879), vol. 18, p. 112. [66] _Comptes-rendus de l'Académie des Sciences_ (Paris, 1879), vol. 89, p. 462. [67] _Verhandlungen der vom 13 bis 16 September 1880 zu München abgehaltenen sechsten allgemeinen Conferenz der Europäischen Gradmessung_ (Berlin, 1881). [68] Ibid., app. 2. [69] Ibid., app. 2a. [70] _Verhandlungen der vom 11 bis zum 15 September 1882 im Haag Vereinigten Permanenten Commission der Europäischen Gradmessung_ (Berlin, 1883). [71] _Verhandlungen der vom 15 bis 24 Oktober 1883 zu Rom abgehaltenen siebenten allgemeinen Conferenz der Europäischen Gradmessung_ (Berlin, 1884). Gen. Cutts attended for the U.S. Coast and Geodetic Survey. [72] Ibid., app. 6. See also, _Zeitschrift für Instrumentenkunde_ (1884), vol. 4, pp. 303 and 379. [73] Op. cit. (footnote 67). [74] _Report of the Superintendent of the U.S. Coast and Geodetic Survey for 1880-81_ (Washington, 1883), p. 26. [75] _Report of the Superintendent of the U.S. Coast and Geodetic Survey for 1889-90_ (Washington, 1891), app. no. 12. [76] _Report of the Superintendent of the U.S. Coast and Geodetic Survey for 1881-82_ (Washington, 1883). [77] _Transactions of the Cambridge Philosophical Society_ (1856), vol. 9, part 2, p. 8. Also published in _Mathematical and Physical Papers_ (Cambridge, 1901), vol. 3, p. 1. [78] Peirce's comparison of theory and experiment is discussed in a report on the Peirce memoir by WILLIAM FERREL, dated October 19, 1890, Martinsburg, West Virginia. _U.S. Coast and Geodetic Survey, Special Reports, 1887-1891_ (MS, National Archives, Washington).