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Annotated translation of H.A. Lorentz, Abhandlungen über Theoretische Physik, "vol. 1" (1907), chapter 14, secs. 12 & 13 (originally in French), and chapter 16, sec. 18 (originally in German), cited in De Witte, "Equivalence of Huygens' principle and Fermat's principle in ray geometry", American Journal of Physics, 27: 293-301, 387 (1959).doi:10.5281/zenodo.3835135 fatcat:pap56x3usvcqfeuiiw3e5ubv3m