and diffuse increased warmth, to an extent that may affect vegetation. The mean temperature of London is a degree or two higher than that of the surrounding country, and Pallas believed, that the climate of even so thinly a peopled country as Russia was sensibly modified by similar causes." His book Man and Nature (1864) constituted an early work of ecology, and played a role in the creation of the Adirondack Park. Marsh argued that deforestation could lead to desertification. Referring to the clearing of once-lush lands surrounding the Mediterranean, he asserted "the operation of causes set in action by man has brought the face of the earth to a desolation almost as complete as that of the moon." He argued that welfare is secured as long as man manages resources and keep them in good condition. Welfare of future generations should be one of resource management determinants. Resource scarcity is a result of misbalancing an environmental equilibrium. In other words: it comes from unreasonable human action rather than is determined by some absolute resource scarcity. Works A Compendious Grammar of the Old Northern or Icelandic Language (1838), compiled and translated from the grammars of Rask The Camel, his Organization, Habits, and Uses, with Reference to his Introduction into the United States (1856) Lectures on the English Language (1860) The Origin and History of the English Language (1862; revised ed., 1885) Man and Nature (1864; Italian tr. 1872) The Earth as Modified by Human Action (1874; rev. ed., 1885), a largely rewritten version of Man and Nature Mediaeval and Modern Saints and Miracles (1876) He prepared an American edition of Hensleigh Wedgwood's Dictionary of English Etymology (New York, 1862), to which he made large additions and annotations. He translated Rask's Icelandic Grammar. Family His second wife, Caroline (Crane) Marsh (1816–1901), whom he married in 1839, published Wolfe of the Knoll and other Poems (1860), and the Life and Letters of George Perkins Marsh (New York, 1888). This last work was left incomplete, the second volume never having been published. She also translated from the German of Johann C. Biernatzki (1795–1840), The Hallig; or the Sheepfold in the Waters (1856). (See "Hallig"). Art collection Marsh actively studied and collected engravings, including European Old Master prints. His collection included more than a thousand prints by various artists, dating from the 15th to the 19th centuries, representing works by Rembrandt, Albrecht Dürer, William