1. Rowland, H., Physical Papers, 596 (Johns Hopkins Univ. Press, Baltimore, 1902).
2. Forman, P., Heilbron, J. L., and Weart, S., Historical Studies in the Physical Sciences, 5, Table 1, 6 (Princeton University Press, Princeton, 1975).
3. Birr, K. A., in Science and Society in the United States (edit. by Tassel, D. D., and Hall, M. G.), 35–80 (Dorsey, Homewood, Illinois, 1966).
4. Ibid., 67 and 289.
5. Mees, C. H. K., Science, 43, 763–73 (1916).