John Burroughs's first book, "Wake-Robin," contained a chapter entitled "The Invitation." It was an invitation to the study of birds. He has reiterated it, implicitly if not explicitly, in most of the books he has published since then, and many of his readers have joyfully accepted it. Indeed, such an invitation from Mr. Burroughs is the best possible introduction to the birds of our Northeastern States, and it is likewise an introduction to some very good reading. To convey this invitation to a wider circle of young readers the most interesting bird stories in Mr. Burroughs's books have been gathered into a single volume. A chapter is given to each species of bird, and the chapters are arranged in a sort of chronological order, according to the time of the bird's arrival in the spring, the nesting time, or the season when for some other reason the species is particularly conspicuous. In taking the stories out of their original setting a few slight verbal alterations have been necessary here and there, but these have been made either by Mr. Burroughs himself or with his approval.