1 10 Modem Fishculture in Fresh and Salt Water. 



"The author next proceeds to describe the formation 

 of eddies, the commonest case being illustrated in Fig. 



FIG. i. 



i, which needs no explanation, the direction and course 

 of the current being represented^ by arrows. Fig. 2 

 shows a curious spiral motion of the water due to the 

 fact that the current on the two sides of the channel 

 sometimes moves with different velocities, setting up a 

 tendency to form a series of eddies. Fig. 3 shows the 

 formation of two kinds of eddies, one in front and one 

 behind an obstructing point of land, which approaches 

 so near to the opposite bank as to deflect the current 

 noticeably, producing the phenomenon known in the 

 Danube as 'Schwall' (swell). Finally we have the 

 continuous circling movements known as whirlpools, 

 which require deep water and such conformation of the 



