1915. Contents: The Constitution of Nature; Radiation; On Radiant Heat in Relation to the Color and Chemical Constitution of Bodies; New Chemical Reactions Produced by Light; The Sky; Voyage to Algeria to Observe the Eclipse; Niagara; The Parallel Roads of Glen Roy; Alpine Sculpture; Recent Experiments on Fog-Signals; On the Study of Physics; On Crystalline and Slaty Cleavage; On Paramagnetic and Diamagnetic Forces; and Physical Basis of Solar Chemistry. See other titles by this author available from Kessinger Publishing.