3923.55 **E.190a.40 Lloyd, Humphrey, D.D. 1800- Elementary treatise on the wave-theory of light. Sd ed., revised and enlarged. Lignans Longmans, 1873. xi, 247 pp. Illus. 8 ° "The former edition of this work was given to the public in the shape of Lectures" **5085.69 . Preface.
-Wave theory of light.