TYNDALL, JOHN, English physicist, born, 1820. Began his original researches in 1847, when teacher of physics in Queenwood College. He and Professor Huxley visited the Alps together, and they wrote a work on the structure and nature of glaciers. It is impossible to detail the work he has done; but his inquiries and experiments in connection with light, heat, sound, and electricity have all had practical results. He is a popular lecturer, and devoted the proceeds of a lecturing tour in this country to founding scholarships at Harvard and Columbia Colleges, for students devoting themselves to original research. Among his books are "Glaciers of the Alps," "Mountaineering," "Heat as a Mode of Motion," "On Radiation," "Hours of Exercise in the Alps," "Fragments of Science," "The Floating Matter of the Air," and volumes on Light, Sound, Electricity, and the forms of water. WALLACE, A.R., English naturalist and traveller, born 1822; was educated as land surveyor and architect, but afterwards devoted himself entirely to Natural History. He explored the Valley of the Amazon and Rio Negro, 1848-52, and travelled in the Malay Archipelago and Papua, 1854-62, publishing the results of his explorations later on. He also wrote "Contributions to the Theory of Natural Selection," "Miracles and Modern Spiritualism," "Geographical Distribution of Animals," "Tropical Nature," "Island Life," etc. GIBERNE, AGNES, English author--living. Began to write at seven years old. Her first story for children was published when she was only seventeen. Her stories for children have not been so popular as her scientific writings, "Sun, Moon, and Stars," "The Starry Skies," "Among the Stars," "The Ocean of Air," "The World's Foundations," "Radiant Suns," etc. WILSON, ANDREW, English physiologist and lecturer, born, 1852. Is the author of "Studies on Life and Sense," "Leisure Time Studies," "Science Stories," "Chapters on Evolution," "Wild Animals," "Brain and Nerve," etc., and is a constant contributor on scientific subjects to the magazines and newspapers, contributing weekly "Science Jottings" to the "Illustrated London News" WONDERS OF EARTH, SEA, AND SKY SUGGESTIONS FOR SUPPLEMENTARY READING Wonder Stories of Science D.N. BEACH Wonders in Monsterland EDWARD W.D. CUMING Ocean Wonders W.E. DAMON Among the Stars AGNES GIBERNE The Scenery of the Heavens JOHN ELLARD GORR Coal and the Coal Miners HOMER GREENE Wonders of the Moon A. GUILLEMIN The Sea and Its Living Wonders. G. HARTWIG The Wonders of Plant Life Under the Microscope SOPHIE B. HERRICK Marvels of Animal Life CHARLES F. HOLDER Old Ocean ERNEST INGERSOLL Modern Seven Wonders of the World C. KENT Madam How and Lady Why CHARLES KINGSLEY Wonders of Optics F. MARION The Wonders of Science HENRY MAYHEW Wonders of Man and Nature E. MENAULT A Century of Electricity T.C. MENDENHALL