The universal geography : earth and its inhabitants

826 i;l SSIA IX EUROPE.of the same sjjecies as that of Lake Peipus, hunted by men for its fat and skin,and preyed upon by M"olves, which, when driven by hunger, will venture acrossthe ice to the middle of the lake. Some of the smaller animals, like the sealitself, recall a time when Ladoga still communicated with the sea. One of theseFig. 175 — Ladoga.Scale 1 : 2,000.000.microscopic organisms, the Compylodiscus radiosus, has hitherto been found elsewhereonly in the Gulf of Mexico, near Vera Cruz.The lake is sometimes swept by gales, which raise heavy seas, billows, andground swells like those of the ocean. Its waters are also kept in a constantferment by its tributaries, to which is perhaps partly due a current settingsteadily along the east coast northwards, and along the west coast southwards.Its level has been determined bv Schubert at about GO feet above that of the Gulf