For information on the subject of rubber and the life of Charles Goodyear, see: H. Wickham, "On the Plantation, Cultivation and Curing of Para Indian Rubber", London (1908); Francis Ernest Lloyd, "Guayule, a Rubber Plant of the Chihuahuan Desert", Washington (1911), Carnegie Institute publication no. 139; Charles Goodyear, "Gum Elastic and Its Varieties" (1853); James Parton, "Famous Americans of Recent Times" (1867); and "The Rubber Industry, Being the Official Report of the Proceedings of the International Rubber Congress" (London, 1911), edited by Joseph Torey and A. Staines Manders. CHAPTER VIII J. W. Roe, "English and American Tool Builders" (1916), and J. V. Woodworth, "American Tool Making and Interchangeable Manufacturing" (1911), give general accounts of great American mechanics. For an account of John Stevens and Robert L. and E. A. Stevens, see George Iles, "Leading American Inventors" (1912); Dwight Goddard, "A Short Story of John Stevens and His Sons" in "Eminent Engineers" (1905), and R. H. Thurston, "The Messrs. Stevens, of Hoboken, as Engineers, Naval Architects and Philanthropists" (1874), "Journal of the Franklin Institute", October, 1874. For Whitney's contribution to machine shop methods, see Olmsted's "Memoir" already cited and Roe and Woodworth, already cited. For Blanchard, see Dwight Goddard, "A Short Story of Thomas Blanchard" in "Eminent Engineers" (1905), and for Samuel Colt, see his own "On the Application of Machinery to the Manufacture of Rotating Chambered-Breech Fire Arms, and Their Peculiarities" (1855), an excerpt from the "Minutes of Proceedings of the Institute of Civil Engineers", vol. XI (1853), and Henry Barnard, "Armsmear; the Home, the Arm, and the Armory of Samuel Colt" (1866). CHAPTER IX "The Story of Electricity" (1919) is a popular history edited by T. C. Martin and S. L. Coles. A more specialized account of electrical inventions may be found in George Bartlett Prescott's "The Speaking Telephone, Electric Light, and Other Recent Electrical Inventions" (1879). For Joseph Henry's achievements, see his own "Contributions to Electricity and Galvanism" (1835-42) and "On the Application of the Principle of the Galvanic Multiplier to Electromagnetic Apparatus" (1831), and the accounts of others in Henry C. Cameron's "Reminiscences of Joseph Henry" and W. B. Taylor's "Historical Sketch of Henry's Contribution to the Electro-Magnetic Telegraph" (1879), Smithsonian Report, 1878.