7 6 



Types of Aquatic Environment 



by evaporation means concentration of solids in solu- 

 tion, and crowding of organisms, with limitation of 

 their food and shelter. The shoreward population of 

 all lakes is subject to a succession of such vicissitudes. 

 The term limnology is often used in a restricted sense 

 as applying only to the study of freshwater lakes. 

 This is due to the profound influence of the Swiss 

 Master, F. A. Forel, who is often called the "Father 

 of Limnology." He was the first to study lakes 

 intensively after modern methods. He made the 

 Swiss lakes the best known of any in the world. 

 His greatest work " Le Lemon," a monograph on 

 Lake Geneva, is a masterpiece of limnological litera- 

 ture. It was he who first developed a comprehen- 

 sive plan for the study of the life of lakes and all 

 its environing conditions. 



