Limnology zoologist) and Einar Naumann (a Swedish botanist) co-founded the International Society of Limnology (SIL, from Societas Internationalis Limnologiae). Forel's original definition of limnology, "the oceanography of lakes", was expanded to encompass the study of all inland waters, and influenced Benedykt Dybowski's work on Lake Baikal. Prominent early American limnologists included G. Evelyn Hutchinson, Ed Deevey, E. A. Birge, and C. Juday. Physical properties of aquatic ecosystems are determined by a combination of heat, currents, waves and other seasonal distributions of environmental conditions. The morphometry of a body of water depends on the type of feature (such as a lake, river,
Subject of labor production process (Marx, 1967, p 174), along with "human labor", and the "means of labor" (tools and infrastructure used to transform the subject of labor). The "subject of labor" and the "means of labor" comprise the means of production of society (Institute of Economics, 1957). "Subject of labor" is sometimes called "object of labor" (e.g., Sheptulin, 1978). In both cases, the term refers to what is being worked on. Institute of Economics of the Academy of Sciences of the U.S.S.R. (1957). Political Economy: A Textbook. London: Lawrence and Wishart. Marx, Karl (1867 | 1967). "Capital" Vol. I. New York: International