ON SMALLER PONDS. 197 



sudden and unexpected, that nearly aU the smaller fish 

 were destroyed by them, before any steps could be 

 taken for their removal. It was, however, then effected 

 by letting out the water, when the jack were placed 

 in one of the smaller ponds above mentioned. In 

 this, however, although it contained a good supply 

 of white fish, they rather lost than gained weight, 

 probably, as Mr. Maltby imagines, in consequence of 

 there being a smaller body of water running through 

 it, and that colder, from being nearer the source. 



" At the commencement of the year 1857, he had 

 purchased and turned into the lake at Boilsfut nine 

 hundred carp of a particularly good breed, weighing, 

 one with another, a pound each ; but of these, when 

 the water was let out in the month of October, not 

 a single one was to be found, the jack not having 

 suffered a solitary individual to escape them. Since 

 that time Mr. Maltby has allowed no jack to be put 

 iuto his water, as stock, above a pound in weight, 

 which (as younger fish do not gaiu weight so fast,) 

 win not increase in a year to more than about three 

 or four pounds. It is only after attaining that weight 

 that their growth becomes so astonishingly rapid. 



" in the lake at Boilsfut, jack, perch, and white 

 fish breed fast, but the fish bom in that lake do 

 not increase so fast by two-thirds as those bom in 



