MY Dear Young Folks,—In the first book which I wrote for you, we traveled together through the Gorilla Country, and saw not only the gigantic apes, but also the cannibal tribes which eat men. In the second book we continued our hunting, and met leopards, elephants, hippopotami, wild boars, great serpents, etc., etc. We were stung and chased by the fierce Bashikouay ants, and plagued by flies. Last spring, your friend Paul, not satisfied with writing for young folks, took it into his head to lecture before them. When I mentioned the subject to my acquaintances, many of them laughed at the notion of my lecturing to you, and a few remarked, "This is another of your queer notions." I did not see it!!! I thought I would try. Thousands of young folks came to your friend Paul's lectures in Boston, Brooklyn, and New York; not only did my young friends come, but a great many old folks were also seen among them. The intelligent, eager faces of his young hearers, their sparkling eyes, spoke t