The word summer, being interpreted, means vacation; and vacation, being interpreted, means-so many things that I have not space in this book to name them. Yet how can there be a vacation without mountains, or seashore, or the fields, or the forests-days out of doors? My ideal vacation would have to be spent in the open; and this book, the larger part of it, is the record of one of my summer vacations-the vacation of the summer of 1912. That was an ideal vacation, and along with my account of it I wish to give you some hints on how to make the most of your summer chance to tramp the fields and woods.For the real lover of nature is a tramp; not the kind of tramp that walks the railroad-ties and carries his possessions in a tomato-can, but one who follows the cow-paths to the fields, who treads the rabbit-roads in the woods, watching the ways of the wild things that dwell in the tree-tops, and in the deepest burrows under ground.Do not tell anybody, least of all yourself, that you love the out-of-doors, unless you have your own path to the woods, your own cross-cut to the pond, your own particular huckleberry-patch and fishing-holes and friendships in the fields. The winds, the rain, the stars, the green grass, even the birds and a multitude of other wild folk try to meet you more than halfway, try to seek you out even in the heart of the great city; but the great out-of-doors you must seek, for it is not in books, nor in houses, nor in cities. It is out at the end of the car-line or just beyond the back-yard fence, maybe-far enough away, anyhow, to make it necessary for you to put on your tramping shoes and with your good stout stick go forth.