504 NATURALISTS CABINET. 



Description. 



preferable time in spring and summer are from 

 eight in the morn until twelve, and from four in 

 the afternoon until after sunset ; and from Sep- 

 tember to January in the middle of the day. 



As the grayling is so swift a swimmer, as to 

 disappear like the passing shadow, it is by some 

 called the umbra n ; and by others, on account of 

 an imaginary scent proceeding from it similar to 

 that of thyme, it is also named thymallus. 



THE COD. 



THE head in the cod fish is smooth ; the 

 color on the back and sides is of a dusky olive, 

 variegated with yellow spots ; its belly is white ; 

 its sides have a long white line running their 

 whole length, from the gills to the tail, which at 

 the abdomen is curved, but elsewhere is straight; 

 its scales are very small, and adhere firmly to the 

 skin; its eyes are large; at the angle of the lower 

 jaws there hangs a single beard, which is short, 

 seldom exceeding a finger's length ; its tongue 

 is broad ; it has several rows of teeth, like the 

 pike ; and in the palate, near the orifice of the 

 stomach, and near the gills, it has small clusters 

 of teeth. It has three back fins, two at the gills, 

 and two at the breast, and two others behind the 

 anus; and the tail is plain. 



These fish are found only in the seas of the 

 northern parts of the world ; and the great ren- 



