Le Léman Monographielimnologique

Abstract

IN this, the first portion of the third volume of his interesting work, Prof. Forel treats of the biology of the Lake of Geneva, and describes with his customary wealth of detail the various forms of life observed in and upon the waters of the lake. From a biological point of view, Prof. Forel divides the lake into three regions: (a) littoral, extending from the shore line down to a depth of fifteen metres; (b) abyssal (profonde), comprising a layer of water about two metres in depth extending from the littoral region all over the bottom of the lake; (c) pelagic, the great mass of water beyond the littoral region and above the abyssal region. The fauna and flora are classified in accordance with these three regions, and as the animals and plants exist in intimate biological relation, they form what Prof. Forel describes as “societes,” so that there is a “societe” pertaining to each region. Descriptions and illustrations are given of the methods and apparatus employed in collecting the organisms in the different regions, and in the sorting out and separation of these organisms when obtained.

Le Léman. Monographielimnologique.

Tome troisième, première livraison. Par Prof. F. A. Forel. Pp. 411· (Lausanne: F. Rouge, 1902.)