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 did, for that experience taught me a valuable lesson. I learned not to commit my talks to memory, but merely to have the topics and facts and general arrangement of the lecture well in mind. By this method, I can change and adapt myself to my audience at any time; and I often have to do this. I am able to feel intuitively whether I have gained my listeners' sympathy and interest, and when I feel that I have not, I immediately take another tack. Another great advantage of not committing what you are going to say to memory, word for word, is the added color and animation and spontaneity which the conversational tone and manner gives the lecture.

"My stereopticon pictures of the heavenly bodies are of great help to me. They naturally add much to the interest, and are really a revelation to most of my audiences, for the reason that they show things that can never be seen with the naked eye. How my father would have delighted in them, and how effectively he would have used them. But celestial photography had not been made practical at the time of his death; it is, indeed, quite a new art, al- 91