Very likely they complain incessantly because they are hungry and the supply of demoiselle nymphs is running short. There are plenty of demoiselles, flitting back and forth across the pools on glittering black wings, which they fold closely to their iridescent green bodies when they light. They are such ladylike dragon-flies that it is no wonder that the name “demoiselle,” which French scientists with admirable gallantry have given them, has stuck. With all their ladylike short and modest flights and the saintly way in which they fold their wings when they light on some leaf beside the pool, a folding as of hands in prayer, the demoiselles are dragon-flies, and each prayer may well be for the soul of some midge or other wee insect captured in the short flight. The true dragon-fly--the one which rests with wings widespread--hunts like a hawk, but the demoiselles seem to take their prey with a gentle grace and charm of manner which ought to make the midge’s last moments his happiest ones. I always suspect them of folding him in a perfumed napkin and eating him with salad dressing and a spoon after they get back to their boudoir, but I cannot prove this any more than I can that it is really a water goblin that grumbles under the flat stone. Many a time I have turned the stones over suddenly, but I never yet was quick enough to surprise the goblin. I have found him there, mind you, but never in his true shape. Always he has managed to transform himself into something different,--perhaps into a spotted turtle or a grouchy horn-pout. I have even known him to turn into an ugly, many-legged helgramite worm, not having time to make the more reputable transformation. It is hard to catch a grumbling goblin asleep, especially in a pool below the witch-hazels, where the brook magic is strong. It is easier to see the demoiselle nymphs. They are not very beautiful or seemingly very savory, and if the water goblins do eat them it is no wonder they grumble. You may have seen a hawk-like dragon-fly skimming about over an open pool dip in swallow fashion to the surface. These sudden and repeated dips are not for a bath nor yet for a drink. What you see is a female dragon-fly laying eggs which shall later hatch and become under-water nymphs, the larvæ of the dragon-fly. But the demoiselles, still rightly named, do nothing so brazen as that. Instead, they pick out some nodding water weed, fold their wings a little more tightly to their iridescent bodies and crawl down it into the water. Here, in proper seclusion beneath the surface, they pierce the reed’s stem with keen ovipositor and lay their eggs. Then they saunter forth again and discreetly eat more midges with salad dressing and a spoon.