"There is no such thing as ignis fatuus nowadays," said Jimmy, "so what can it be?"

"I vote we go and see," said Frank.

"You will only get bogged if you do. It is dangerous enough to walk on the marsh in the daylight, and almost impossible by night."

"It strikes me there is a narrow channel, or dyke, leading from the river, which may lead to where that light is. I saw a line of water about twenty yards off. We passed it as we were about to anchor. Let us take the boat and go up it, if you wish to see what it is," said Jimmy.

His suggestion was approved of, and they dressed and stepped into the punt, and after a little while they found the dyke and pushed their way along it. They moved cautiously and with little noise, and at last emerged upon a small open piece of water, and as they did so, the light gleamed for a moment and went out. They peered eagerly through the gloom, but could see nothing. All was silent and still, and very uncanny.

"It is no good staying here," said Frank; "let us go back and try to sleep, or we shall not be fit to be seen to-morrow when we meet the others at Wroxham."

So they rowed back, wondering what the cause of the light had been. They tumbled into their berths again and got just an hour's broken sleep before the dawn effectually aroused them. It was very early, but they had no choice but to rise and get something to eat. The morning was bright and cloudless, the lark sang merrily in the sky, waterfowl swam on the quiet stretches of the river in peaceful security, the freshness and charm which always accompanies the early dawn of day in the country had its natural effect upon them; and their spirits, which had been somewhat depressed by the uncomfortable night which they had passed, rose again to their natural height. Dick now suggested that they should again explore the windings of the creek, and try to find out the cause of the mysterious light which had so puzzled them the night before. They accordingly rowed up the lane of water as they had done the previous night, until they came to the piece of open water. Just as they were about to emerge from the narrow opening in the belt of reeds which surrounded it, Frank checked the motion of the boat by clutching hold of the reeds, and warned his companions to be silent. Looking in the direction in which he pointed, they saw the most curious bird they had ever seen, or were ever likely to see. On a little hillock on the edge of the reeds was a bird with a body like a thrush, but with long legs. It had a long beak, staring eyes, brown tufts of feathers on each side of its head, and a large flesh-coloured ruff of feathers round its neck.

"I know what that is; it is a ruff," said Jimmy.

"Yes, yes, but be quiet and watch it."

They drew back behind the green fringe of reeds and watched the movements of the ruff, for such it was. Its movements were as strange as itself. It pranced up and down on the little hillock and fluttered its wings, and uttered a defiant cry. It seemed as if it were particularly desirous of attention from one spot in the marsh, for towards that spot its glances and movements were directed. Looking more eagerly towards this spot the boys saw a smaller bird, with no ruff around her neck, and clad in sober brown. This was a female, or reeve, and the male was showing himself off before her and trying to attract her attention, while she, with the tantalising nature of her sex, appeared to be quite unconscious of his blandishments, and went on composedly picking up her breakfast from the insects and worms in the marsh. Presently another ruff appeared on the scene, and, joining his rival on the little hillock, he commenced to emulate his performances, and the two danced a war-dance in the most amusing fashion, to the great delight of the three observers. The natural consequence of this rivalry soon followed, and the two ruffs began to fight in good earnest, laying hold of each other with their bills, and striking with their wings. The one drove the other to the bottom of the hill, and was apparently master of the field; but instead of returning to his post on the top, he flew away, leaving his adversary fluttering vainly, and evidently fast by the leg. Then the rushes on the other side of the open space were pushed aside, and a man in a rude boat made his appearance, and proceeded to seize the ruff and kill it.