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Only one good-sized animal, so far as known, is now peculiar to the British Isles, and that is our familiar friend the red grouse of the Scotch moors. I doubt, however, whether even he is really indigenous in the strictest sense of the word: that is to say, whether he was evolved in and for these islands exclusively, as the moa and the apteryx were evolved for New Zealand, and the extinct dodo for Mauritius alone. It is far more probable that the red grouse is the original variety of the willow grouse of Scandinavia, which has retained throughout the year its old plumage, while its more northern cousins among the fiords and fjelds have taken, under stress of weather, to donning a complete white dress in winter, and a grey or speckled tourist suit for the summer season.

Even since the insulation of Britain a great many new plants and animals have been added to our population, both by human design and in several other casual fashions. The fallow deer is said to have been introduced by the Romans, and domesticated ever since in the successive parks of Celt and Saxon, Dane and Norman. The edible snail, still scattered thinly over our southern downs, and abundant at Box Hill and a few other spots in Surrey or Sussex, was brought over, they tell us, by the same luxurious Italian epicures, and is even now confined, imaginative naturalists declare, to the immediate neighbourhood of Roman stations. The mediaeval monks, in like manner, introduced the carp for their Friday dinners. One of our commonest river mussels at the present day did not exist in England at all a century ago, but was ferried hither from the Volga, clinging to the bottoms of vessels from the Black Sea, and has now spread itself through all our brooks and streams to the very heart and centre of England. Thus, from day to day, as in society at large, new introductions constantly take place, and old friends die out for ever. The brown rat replaces the old English black rat; strange weeds kill off the weeds of ancient days; fresh flies and grubs and beetles crop up, and disturb the primitive entomological balance. The bustard is gone from Salisbury Plain; the fenland butterflies have disappeared with the drainage of the fens. In their place the red-legged partridge invades Norfolk; the American black bass is making himself quite at home, with Yankee assurance, in our sluggish rivers; and the spoonbill is nesting of its own accord among the warmer corners of the Sussex downs.

In the plant world, substitution often takes place far more rapidly. I doubt whether the stinging nettle, which renders picnicking a nuisance in England, is truly indigenous; certainly the two worst kinds, the smaller nettle and the Roman nettle, are quite recent denizens, never straying, even at the present day, far from the precincts of farmyards and villages. The shepherd’s-purse and many other common garden weeds of cultivation are of Eastern origin, and came to us at first with the seed-corn and the peas from the Mediterranean region. Corn-cockles and corn-flowers are equally foreign and equally artificial; even the scarlet poppy, seldom found except in wheat-fields or around waste places in villages, has probably followed the course of tillage from some remote and ancient Eastern origin. There is a pretty blue veronica which was unknown in England some thirty years since, but which then began to spread in gardens, and is now one of the commonest and most troublesome weeds throughout the whole country. Other familiar wild plants have first been brought over as garden flowers. There is the wall-flower, for instance, now escaped from cultivation in every part of Britain, and mantling with its yellow bunches both old churches and houses and also the crannies of the limestone cliffs around half the shores of England. The common stock has similarly overrun the sea-front of the Isle of Wight; the monkey-plant, originally a Chilian flower, has run wild in many boggy spots in England and Wales; and a North American balsam, seldom cultivated even in cottage gardens, has managed to establish itself in profuse abundance along the banks of the Wey about Guildford and Godalming. One little garden linaria, at first employed as an ornament for hanging-baskets, has become so common on old walls and banks as to be now considered a mere weed, and exterminated accordingly by fashionable gardeners. Such are the unaccountable reverses of fortune, that one age will pay fifty guineas a bulb for a plant which the next age grubs up unanimously as a vulgar intruder. White of Selborne noticed with delight in his own kitchen that rare insect, the Oriental cockroach, lately imported; and Mr. Brewer observed with joy in his garden at Reigate the blue Buxbaum speedwell, which is now the acknowledged and hated pest of the Surrey agriculturist.