"One has only to sit down in the woods or the fields, or by the shore of the river of the lake, and nearly everything of interest will come round to him,--the birds, the animals, the insects; and presently, after his eye has gotten accustomed to the place, and to the light and shade, he will probably see some plant or flower that he has sought in vain, and that is a pleasant surprise to him. So, on a large scale, the student and lover of nature has this advantage over people who gad up and down the world, seeking some novelty or excitement; he has only to stay at home and see the procession pass."