The Ephemerae, too, are far more important in rapid and rocky streams
than in the deeper, stiller waters of the south. It is worth while
for a good fish to rise at them there; the more luxurious chalk trout
will seldom waste himself upon them, unless he be lying in shallow
water, and has but to move a few inches upward.

But these Ephemerae, like all other naiads, want working out. The
species which Mr. Ronalds gives, are most of them, by his own
confession, very uncertain. Of the Phryganidae he seems to know
little or nothing, mentioning but two species out of the two hundred
which are said to inhabit Britain; and his land flies and beetles are
in several cases quite wrongly named. However, the professed
entomologists know but little of the mountain flies; and the angler
who would help to work them out would confer a benefit on science, as
well as on the 'gentle craft.' As yet the only approach to such a
good work which I know of, is a little book on the trout flies of
Ripon, with excellent engravings of the natural fly. The author's
name is not given; but the book may be got at Ripon, and most
valuable it must be to any North-country fisherman.

But come, we must not waste our time in talk, for here is a cloud
over the sun, and plenty more coming up behind, before a ruffling
south-west breeze, as Shelley has it -


'Calling white clouds like flocks to feed in air.'


Let us up and onward to that long still reach, which is now curling