46 GROWTH PROMOTED BY CHANGE OF WATER. [PART I. 
fish should not, by selection, proper management, 
and feeding, be susceptible of improvement, just 
as much as those of cattle, sheep, or poultry: 
all that is required to insure it is doubtless care- 
ful attention combined with a discriminating 
judgment, such as Mr Maltby has brought to bear 
upon the subject. It is much to be hoped that 
it may be taken up by others who have time and 
opportunities for prosecuting it, and that, stimu- 
lated by his example, and encouraged by his 
success, they will be induced to persevere, until 
they have shewn that the many thousand acres 
occupied by now unprofitable ponds, may be made 
to return as good, if not (as I believe may be 
the case) a better rate of interest, than the land 
surrounding them. 
The following incident occurs to me as decid- 
edly tending to confirm Mr Maltby’s observation, 
that the growth of fish is, under certain circum- 
stances, much promoted by their transfer from 
one piece of water to another. 
In a pond, the Roach in which were very 
numerous, and ran generally from about four to 
six inches in length, a friend and I one morning, 
just at the close of the hay-harvest—throwing a 
worm fly-fashion, and drawing it in very slowly— 
