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,
The Rise of Magic in Early Medieval Europe that it could be beneficial for humanity. Divided into four parts, in the book's introductory section, Flint discusses the source material that she is drawing from, and offers an overview of the view of magic that medieval society inherited from both the Classical world and the Judeo-Christian tradition. Flint's book would come to be recognised as the most authoritative study of the subject of early medieval magic across Europe. Chapter one, "The Scope of the Study", begins by exploring what magic is and what it meant to Early Medieval society. For the purpose of her study, Flint defines "magic" as