"The murmuring surge That on the unnumbered idle pebbles chafes," his own experience being that sea-shores are sandy; but the pebbled cliffs of Folkestone, with not a grain of sand on the chalk foundation, justified the poet. This lover of nature loves not only the beautiful things he sees, but he loves what they suggest, what they remind him of, what they bid him aspire to. Like Wordsworth, he "looks on the hills with tenderness, and makes deep friendship with the streams and groves." He notes what he divines by observation. And what an observer he is! He discovers that the bobolink goes south in the night. He scraped an acquaintance with a yellow rumpled warbler who, taking the reflection of the clouds and blue sky in a pond for a short cut to the tropics, tried to cross it; with the result of his clinging for a day and night to a twig that hung down in the water. Burroughs has found that whatever bait you use in a trout stream,--grasshopper, grub, or fly,--there is one thing you must always put on your hook; namely, your heart. It is a morsel they love above everything else. He tells us that man has sharper eyes than a dog, a fox, or any of the wild creatures except the birds, but not so sharp an ear or a nose; he says that a certain quality of youth is indispensable in the angler, a certain unworldliness and readiness to invest in an enterprise that does not pay in current coin. He says that nature loves to enter a door another hand has opened: a mountain view never looks better than when one has been warmed up by the capture of a big trout. Like certain wary game, she is best taken by seeming to pass her by, intent on other matters. What he does not find out for himself, people tell him. From a hedge-cutter he learns that some of the birds take an earth-bath and some a water-bath, while a few take both; a farmer boy confided to him that the reason we never see any small turtles is because for two or three years the young turtles bury themselves in the ground and keep hidden from observation. From a Maine farmer he heard that both male and female hawks take part in incubation. A barefooted New Jersey boy told him that "lampers" die as soon as they have built their nests and laid their eggs. How apt he is in similes! The pastoral fields of Scotland are "stall-fed," and the hill-sides "wrinkled and dimpled, like the forms of fatted sheep."