When I first visited California, it was my good fortune to see the "big trees," the Sequoias, and then to travel down into the Yosemite, with John Muir. Of course of all people in the world he was the one with whom it was best worth while thus to see the Yosemite. He told me that when Emerson came to California he tried to get him to come out and camp with him, for that was the only way in which to see at their best the majesty and charm of the Sierras. But at the time Emerson was getting old and could not go. John Muir met me with a couple of packers and two mules to carry our tent, bedding, and food for a three days' trip. The first night was clear, and we lay down in the darkening aisles of the great Sequoia grove. The majestic trunks, beautiful in color and in symmetry, rose round us like the pillars of a mightier cathedral than ever was conceived even by the fervor of the Middle Ages. Hermit thrushes sang beautifully in the evening, and again, with a burst of wonderful music, at dawn. I was interested and a little surprised to find that, unlike John Burroughs, John Muir cared little for birds or bird songs, and knew little about them. The hermit-thrushes meant nothing to him, the trees and the flowers and the cliffs everything. The only birds he noticed or cared for were some that were very conspicuous, such as the water-ousels--always particular favorites of mine too. The second night we camped in a snow-storm, on the edge of the canyon walls, under the spreading limbs of a grove of mighty silver fir; and next day we went down into the wonderland of the valley itself. I shall always be glad that I was in the Yosemite with John Muir and in the Yellowstone with John Burroughs. Like most Americans interested in birds and books, I know a good deal about English birds as they appear in books. I know the lark of Shakespeare and Shelley and the Ettrick Shepherd; I know the nightingale of Milton and Keats; I know Wordsworth's cuckoo; I know mavis and merle singing in the merry green wood of the old ballads; I know Jenny Wren and Cock Robin of the nursery books. Therefore I had always much desired to hear the birds in real life; and the opportunity offered in June, 1910, when I spent two or three weeks in England. As I could snatch but a few hours from a very exciting round of pleasures and duties, it was necessary for me to be with some companion who could identify both song and singer. In Sir Edward Grey, a keen lover of outdoor life in all its phases, and a delightful companion, who knows the songs and ways of English birds as very few do know them, I found the best possible guide.