On the other hand, the societies may claim to have saved parts of the river from being entirely deprived of fish, for it is not long since it appeared as if the stream would be quite cleared out. Large quantities of fish have also been placed in the river taken from ponds and bodily transported to the Thames. So that upon the whole the fish have been well looked after of recent years. The more striking of the aquatic plants--such as white water-lilies--have been much diminished in quantity by the constant plucking, and injury is said to have been done by careless navigation. In things of this kind a few persons can do a great deal of damage. Two or three men with guns, and indifferent to the interests of sport or natural history, at work every day, can clear a long stretch of river of waterfowl, by scaring if not by actually killing them. Imagine three or four such gentry allowed to wander at will in a large game preserve--in a week they would totally destroy it as a preserve. The river, after all, is but a narrow band as it were, and is easily commanded by a gun. So, too, with fish poachers; a very few men with nets can quickly empty a good piece of water: and flowers like water-lilies, which grow only in certain spots, are soon pulled or spoiled. This aspect of the matter--the immense mischief which can be effected by a very few persons--should be carefully borne in mind in framing any regulations. For the mischief done on the river is really the work of a small number, a mere fraction of the thousands of all classes who frequent it. Not one in a thousand probably perpetrates any intentional damage to fish, fowl, or flowers.