ON SMALLER PONDS. 165 



yet he believes the qualities of the waters flowing 

 through them to be different, the sources from which 

 they are derived being distinct. 



" With a view, therefore, of promoting the growth 

 of his fish — a change of water being in his opinion 

 the means which, more than any other, conduce to 

 improve both their size and quality — he every other 

 year transports the smaller fish from Boilsfut to La 

 Hulpe, and vice versa. This he effects by carting 

 them across in barrels, the proportion of water to fish 

 in each being one-third water and two-thirds fish. 

 In order to insure them a due supply of air during 

 the transit, the hole in the side of each barrel is 

 bunged up with a wisp of straw. By the jolting of 

 the cart the fish are kept in continual motion, and, 

 while the water is prevented from escaping, it be- 

 comes, by being shaken against the straw, sufficiently 

 charged with external air for the purpose of respira- 

 tion. By adopting this mode of carriage, he never 

 loses five pounds' weight out of three thousand pounds 

 transported. 



" The effect which such a change has upon jack 

 appears to be most remarkable, thenncrease in their 

 weight, after removal, being, in some cases, at the rate 

 of not less than from eight to ten pounds a year. In 

 the year 1856, for instance, Mr. Maltby marked and 



