COMMON COD Oil KEELING. 109 



which are taken ; and as the garbage in all cases 

 causes the fish to leave the spot, some idea of 

 the injury done may be formed from the fact that 

 every twenty fishermen throw over ten tons a 

 week ; if in place of suffering this, the Govern- 

 ment stationed a cruiser there to compel the 

 removal to land of the offal, they would be doing 

 good in two directions, as they would preserve the 

 fishing ground of Rockall untainted, and at the 

 same time cause a supply (including the bodies of 

 sharks) of 20,000 tons of manure, which could be 

 collected and manufactured annually at a trifle 

 of cost. The revenue to be derived therefrom 

 would be 120,000; the price per ton of this 

 guano 6 10s. Od. ; it is a much stronger manure 

 than the original guano, and its beneficial effects 

 are visible in the crops for three years after it 

 has been laid on. 



