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 Secret of Divine Civilization societies need, and that certain valuable subjects are neglected in the process. His counsel on this is that "the individual should, prior to engaging in the study of any subject, ask himself what its uses are and what fruit and result will derive from it. If it is a useful branch of knowledge, that is, if society will gain important benefits from it, then he should certainly pursue it with all his heart." The Secret of Divine Civilization The Secret of Divine Civilization is a book written anonymously by `Abdu'l-Bahá in 1875, addressed to the rulers and the people of