Besides his outdoor sketches and the other papers already mentioned, Mr. Burroughs has written a number of critical essays on life and literature, published in Indoor Studies, and other volumes. He has also taken his readers into his confidence in An Egotistical Chapter, the final one of his Indoor Studies; and in the Introduction to the Riverside Edition of his writings he has given us further glimpses of his private intellectual life. Probably no other American writer has a greater sympathy with, and a keener enjoyment of, country life in all its phases--farming, camping, fishing, walking--than has John Burroughs. His books are redolent of the soil, and have such "freshness and primal sweetness," that we need not be told that the pleasure he gets from his walks and excursions is by no means over when he steps inside his doors again. As he tells us on more than one occasion, he finds he can get much more out of his outdoor experiences by thinking them over, and writing them out afterwards. Numbers 28, 36, and 92 of the Riverside Literature Series consist of selections from Mr. Burroughs's books. No. 28, which is entitled Birds and Bees, is made up of Bird Enemies and The Tragedies of the Nests from the volume Signs and Seasons, An Idyl of the Honey-Bee from Pepacton, and The Pastoral Bees from Locusts and Wild Honey. The Introduction, by Miss Mary E. Burt, gives an account of the use of Mr. Burroughs's writings in Chicago schools. In No. 36, Sharp Eyes, and Other Papers, the initial paper, Sharp Eyes, is drawn from Locusts and Wild Honey, The Apple comes from Winter Sunshine, A Taste of Maine Birch and Winter Neighbors from Signs and Seasons, and Notes by the Way (on muskrats, squirrels, foxes, and woodchucks) from Pepacton. The collection called A Bunch of Herbs, and Other Papers, forming No. 92 of the Series, was designed with special reference to what the author has to say of trees and flowers, and contains A Bunch of Herbs from Pepacton, Strawberries from Locusts and Wild Honey, A March Chronicle and Autumn Tides from Winter Sunshine, A Spray of Pine and A Spring Relish from Signs and Seasons, and English Woods: A Contrast from Fresh Fields. INTRODUCTION. It is seldom that I find a book so far above children that I cannot share its best thought with them. So when I first took up one of John Burroughs's essays, I at once foresaw many a ramble with my pupils through the enchanted country that is found within its breezy pages. To read John Burroughs is to live in the woods and fields, and to associate intimately with all their little timid inhabitants; to learn that-- "God made all the creatures and gave them our love and our fear, To give sign, we and they are his children, one family here."