Treatise on light. In which are explained the causes of that which occurs in reflexion, & in refraction. And particularly in the strange refraction of Iceland crystal. Christiaan Huygens. Rendered into Englich by Silvanus P. Thompson. Traité de la lumière. English Huygens, Christiaan, 1629-1695. Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, tr. Wave theory of light Early works to 1800. Refraction, Double Early works to 1800. QC425 .H97 535.32 HUT London : MacMillan and co., limited, 1912. 1912. 1912 Text xii, 128 p. : eng engfre