n particular pools, and even for particular parts of
pools. You have fished in this deep pool; and if you were to change it for
a shallower one, such as that above, it would be proper to use smaller
flies of the same colour; and in a pool still deeper, larger flies;
likewise in the rough rapid at the top, a larger fly may be used than
below at the tail of the water; and in the Tweed, or Tay, I have often
changed my fly thrice in the same pool, and sometimes with success--using
three different flies for the top, middle, and bottom. I remember when I
first saw Lord Somerville adopt this fashion, I thought there was fancy in
it; but experience soon proved to me how accomplished a salmon-fisher was
my excellent and lamented friend, and I adopted the lesson he taught me,
and with good results, in all bright waters.

_Hooks._

_Hal_--I never use any hooks for salmon-fishing, except those which I am
sure have been made by O'Shaughnessy, of Limerick; for even the hooks made
in Dublin, though they seldom break, yet they now and then bend; and the
English hooks made of cast steel in imitation of Irish ones are the worst
of all. _There_ is a fly nearly of the same colour as that which is
destroyed; and I can tell you that I saw it made at Limerick by
O'Shaughnessy himself, and tied on one of his own hooks. Should you catch
with it a fish even of 30 lbs., I will answer for its strength and temper;
it will neither break nor bend.--We should have such hooks in England, but
the object of the fishing-tackle makers is to obtain them cheap, and most
of their hooks are made to sell, and good hooks cannot be sold but at a
good price.--The early Fellows of the Royal Society, who attended to all
the useful and common arts, even improved fish-hooks; and Prince Rupert,
an active member of that illustrious body, taught the art of tempering
hooks to a person of the name of Kirby, under whose name, for more than a
century, very good hooks were sold.

_Variety in Trout._

_Phys._--Tell us why they are so different from the river-trout, or why
there should be two species or varieties in the same water.--_Hal._ Your
question is a difficult one, and it has already been referred to in a
former conversation; but I shall repeat what I stated before, that
qualities occasioned by food, peculiarities of water, &c. are transmitted
to the offspring, and produce varieties which retain their characters as
long as they are exposed to the same circumstan