THE KEILLER OTTER-TRAP. 



387 



The Otter is also frequently taken in the Fall-Stock, 

 which is in principle the same as that used for the capture 

 of the Capercali ; but the upper and lower blocks should 

 be heavier, and both armed with long iron spikes placed 

 from one to two inches apart. It should be constructed 

 of old materials, especially of wood that has long lain 

 in the water, for such as is fresh cut is apt to batch the 

 eye of the beast. This device is set either on land, in 

 the run of the animal, or in the stream itself, where 

 the water is so shallow as not to obstruct the action of 

 the down-fall or drop. 



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THE KEILLER OTTER-TRAP. 



But perhaps the best and most ingenious device for 

 the capture of the Otter is that adopted by Mr. Keiller 

 on the river Save, near Gothenburg, the nature of which, 

 by the aid of the above diagram, will be very readily 

 understood : 



A A represents the longitudinal section of the eel- 



2 c 2 



