I am often asked which of his books have made the strongest appeal to youth. The impulse is to answer that it depends upon the particular type of youth. As example, there lies before me a letter from a friend: "Ruth (she is eleven) has been reading every book of your husband's that she can get hold of. She is crazy over the stories. I have bought nearly all of them, but cannot find 'The Son of the Wolf,' 'Moon Face,' and 'Michael Brother of Jerry.' Will you tell me where I can order these?" I have not yet learned Ruth's favorites; but I smile to myself at thought of the re-reading she may have to do when her mind has more fully developed. The youth of every country who read Jack London naturally turn to his adventure stories--particularly "The Call of the Wild" and its companion "White Fang," "The Sea Wolf," "The Cruise of the Snark," and my own journal, "The Log of the Snark," and "Our Hawaii," "Smoke Bellew Tales," "Adventure," "The Mutiny of the Elsinore," as well as "Before Adam," "The Game," "The Abysmal Brute," "The Road," "Jerry of the Islands" and its sequel "Michael Brother of Jerry." And because of the last named, the youth of many lands are enrolling in the famous Jack London Club. This was inspired by Dr. Francis H. Bowley, President of the Massachusetts S.P.C.A. The Club expects no dues. Membership is automatic through the mere promise to leave any playhouse during an animal performance. The protest thereby registered is bound, in good time, to do away with the abuses that attend animal training for show purposes. "Michael Brother of Jerry" was written out of Jack London's heart of love and head of understanding of animals, aided by a years'-long study of the conditions of which he treats. Incidentally this book contains one of the most charming bits of seafaring romance of the Southern Ocean that he ever wrote. During the Great War, the English speaking soldiers called freely for the foregoing novels, dubbing them "The Jacklondons"; and there was also lively demand for "Burning Daylight," "The Scarlet Plague," "The Star Rover," "The Little Lady of the Big House," "The Valley of the Moon," and, because of its prophetic spirit, "The Iron Heel." There was likewise a desire for the short-story collections, such as "The God of His Fathers," "Children of the Frost," "The Faith of Men," "Love of Life," "Lost Face," "When God Laughs," and later groups like "South Sea Tales," "A Son of the Sun," "The Night Born," and "The House of Pride," and a long list beside. But for the serious minded youth of America, Great Britain, and all countries where Jack London's work has been translated--youth considering life with a purpose--"Martin Eden" is the beacon. Passing years only augment the number of messages that find their way to me from near and far, attesting the worth to thoughtful boys and girls, young men and women, of the author's own formative struggle in life and letters as partially outlined in "Martin Eden."