NOTES of a COURSE of NINE LECTURES on LIGHT, delivered at the Royal Institution of Great Britain, 1869. Crown 8vo. 1_s._ 6_d._ NOTES of a COURSE of SEVEN LECTURES on ELECTRICAL PHENOMENA and THEORIES, delivered at the Royal Institution of Great Britain, 1870. Crown 8vo. 1_s._ 6_d._ LESSONS in ELECTRICITY at the ROYAL INSTITUTION, 1875-1876. With 58 Woodcuts and Diagrams. Crown 8vo. 2_s._ 6_d._ THE GLACIERS of the ALPS: being a Narrative of Excursions and Ascents. An Account of the Origin and Phenomena of Glaciers, and an Exposition of the Physical Principles to which they are related. With 6 Illustrations. Crown 8vo. 6_s._ 6_d._ net. ‘Silver Library’ Edition, 3_s._ 6_d._ HOURS of EXERCISE in the ALPS. With 7 Illustrations. Crown 8vo. 6_s._ 6_d._ net. ‘Silver Library’ Edition, 3_s._ 6_d._ FARADAY as a DISCOVERER. With 2 Portraits. Fcp. 8vo. 3_s._ 6_d._ LONGMANS, GREEN, & CO. 39 Paternoster Row, London New York, Bombay, and Calcutta.