EYE OF YOUls^G FISH. 123 



beautiful silver-and-gold lining which the 

 angler will see if he cuts open the eye of the 

 next fish he kills. It is especially well seen 

 in the eye of the cod. 



This eye, however well suited for the 

 purposes of avoiding danger, is by no means 

 tolerant of light, a fact which I observed and 

 immediately acted upon, for one day I found 

 to my horror that many of the young salmon 

 (the first lot) in " The Field " apparatus were 

 beginning to die. I immediately lessened 

 their depth of water, and put them in water 

 about an inch and a half, and not four inches 

 deep ; but still the little things persisted in 

 dying. I could not at first make out the 

 cause, till at last, having watched them most 

 attentively, I observed that they one and all 

 poked their noses under the stones, as if 



