A quaint instance of transportation of fish spawn is given by an old writer. Izaak Walton believed that pike were bred from pickerel-weed; though he seems to have had some suspicion of this piece of unnatural history, and qualifies his statement by saying that if it is not so "they are brought into some ponds some such other ways as is past man's finding out." But one of his contemporaries attacks this heterodoxy, and "propounds a rational conjecture of the heron-shaw." He thinks it quite likely that while fishing the heron might "lap some spawn about her legs", in regard to adhering to the segs and bull-rushes near the shallows, as myself and others without curiosity, have observed. And this slimy substance adhering to her legs, and she mounting the air for another station, in all probability mounts with her. When note, the next pond she haply arrives at, possibly she may leave the spawn behind her, an observation now known to be strictly accurate. Herons are not the only birds which are aids to dispersal. Although the feet of birds are generally clean, Darwin in one case removed sixty-one grains, and in another twenty-two grains, of dry argillaceous earth from the foot of a partridge, and in the earth there was a pebble as large as the seed of a vetch. The same naturalist had sent to him by a friend the leg of a woodcock, with a little cake of dry earth attached to the shank, and weighing only nine grains; this contained seeds of the toad-rush, which not only germinated but flowered. But perhaps the most interesting case of all was that of a red-legged partridge forwarded by Professor Newton. This had been wounded, and was unable to fly; and a ball of hard earth adhered to it, weighing six and a half ounces. The earth had been kept for three years, but when broken and watered, and placed under a bell-glass, no fewer than eighty-two plants sprang from it.