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,
International Society for the Interdisciplinary Study of Symmetry International Society for the Interdisciplinary Study of Symmetry The International Symmetry Society ("International Society for the Interdisciplinary Study of Symmetry", abbreviated name SIS) is a non-profit organization registered in Hungary (Budapest, Vármegye u. 7. II. 3., H-1052). Its main objectives are: The topic was introduced for the first time by Russian and Polish scholars. Then in 1952, Hermann Weyl published his fascinating book "Symmetry", which was later translated into 10 languages. Since then, it became an attractive subject of research in various fields. A variety of manifestations of the principle of symmetry in sculpture, painting, architecture, ornament, and design, in