In quiet, sheltered places, where the water is clear but does not run too swiftly, the ‘minnie,’ as the stickleback is locally called, makes its nest beside the bank. A small hole in the sand is excavated, and in this are laid a number of tiny fibres such as are carried along by the stream, resembling a miniature faggot. On these fibres the ova are deposited, and they are then either purposely partly covered with sand by the minnie, or else the particles that are brought down by the current gather over the bundle of fibres and conceal it, excepting one small spot. There several of the slender roots seem to slightly project, and they are kept clear of mud or sand so as to answer the purpose of a doorway. I have watched these operations many times, but never saw the minnie attempt to enter the nest; indeed, he could not have done, so, the opening not being large enough.

When the nest has reached this stage of completion it is easy to discover, because the stickleback keeps watch before it, and at that season his breast is of a bright crimson hue. He guards the nest with the greatest care, and if he is tempted away for a minute by some morsel of food he is back again immediately. If a tiny twig or fibre comes along and threatens to catch against the nest, he removes it in his mouth, carrying it out into the stream that it may be swept away. He also removes the sand whenever it begins to accumulate overmuch. It would seem as if a current of fresh water were essential to the ova, and that that is why the opening of the nest is so carefully kept from becoming choked up. After a while the fry come forth—the most minute creatures imaginable, mere lines about half the length of the fingernail. They play round the opening, and will retreat within if alarmed.

Where the brook passes under a bridge of some size the current divides to go through several small arches. There is here some fall, and the stream is swift and bright, chafing round and bubbling over stones. Here the ‘miller’s thumbs’ are numerous—a bottom fish growing to about four inches in length, and with a head enormously broad and large in proportion to its body. They rarely rise from the mud or sand; they hide behind stones, their heads buried in the sand, but their tails in sight. Every now and then they change positions, swimming swiftly over the bottom to another spot. Their voracity is very great, and they often disappoint the angler by taking his bait. The cottage people are said to eat them.

The ‘stwun loach’—stone loach, as the lads call it—hides also behind and under stones, and may be caught by hand. These loach are apparently capricious in their habits; certain spots abound with them, in others you may search the stream in vain for a long distance. So, too, with the gudgeon: I noticed in one brook I frequently passed that they never came up beyond one particular bend, though there was no apparent difference in the soil or in the stream itself. In the brook the jack do not seem to care much about them; but in the lake above there are no gudgeon, and there a gudgeon is a fatal bait. Nothing is so certain to take; the gudgeon will tempt the pike there when an ordinary roach may be displayed before him without the slightest effect.

A flood which brings down a large quantity of suspended mud and sand discolouring the water attracts the fish: they are looking for food. But too much mud compels them to shift their quarters. This is well known to those who net the stream. They stretch the net across the brook a few yards below a bridge or short culvert—places much haunted by fish. Then the bottom of the stream above the culvert is thoroughly stirred up with a pole till the water is thick with mud, and this, passing through the culvert (where the pole cannot be used and the fish would otherwise be safe), forces them to descend the stream and enter the net. Probably they attempt to swim up stream first, but are deterred by the pole thrust under the water, and then go down. It is said that even eels, who like mud, will move if the volume of mud sent through is thick enough and continued sufficiently long.

The fact that a little stirring of the bottom attracts fish is made use of along the Thames to attract bait for those night-lines which are the detestation of the true angler. The bait catcher has a long pole, at the end of which are iron teeth like a rake. With this he rakes up the mud, waits a few seconds, and then casts a net, which generally brings some minnows or other small fish to shore. These fish are then placed in a bucket, and finally go on the night-lines.

The ditches as they open on the brook are the favourite resorts of all aquatic life, and there most of the insects, beetles, etc, that live in the water may be discovered. They form, too, one of the last resorts of the reeds; these beautiful plants have been much diminished in quantity by the progress of agriculture. One or two great mounds by the brook can show a small bed still, and here and there a group grows at the mouth of these deep ditches, on the little delta formed of the sand, mud, and decaying twigs brought down. I have cut them fifteen feet in length. Some people, attracted by the beauty of the feathery heads of these reeds, come a considerable distance to get them. I have made pens of them: it is possible to write with such pens, and they are softer than quills, but on account of that softness quickly wear out.

A woodcock may occasionally be flushed from such a ditch in winter. Woodcocks are fond of those ditches down which there always trickles a tiny thread of water—hardly so much as would be understood by the term streamlet—coming from a little spring which even in severe frosts is never frozen. Ever when the running brook is frozen such little spring: are free of ice, and so, too, is the streamlet for some distance.

From the bed of the brook proper the reeds are gone—they have taken refuge in nooks and corners. This is probably accounted for by the periodical cleaning out of the brook—not annually, but every now and then, in order to prevent the flooding which would be caused by the accumulation of mud and sand. The roots of the flags seem to withstand this rod: treatment; but many other water plants cannot, and are consequently only found in places which have not been disturbed for many years.

There is as much difference in ponds as in hedges, so far as inhabitants are concerned. Many fields and hedges seem comparatively deserted, while others are full of birds; and so of several ponds which do not apparently vary much—one is a favourite haunt of fish, and another has not got a single fish in it. One pond particularly used to attract my attention, because it seemed devoid of any kind of life: not even a stickleback could be found in it, though they will live in the smallest ditches, and this pond was fed by a brook in which there were fish. Not even a newt lived in it—it was a miniature Dead Sea. Another pond was remarkable for innumerable water-snails. When the wind blew hard they sometimes lined the lee shore to which they had drifted.