knowledge of the workings of nature to fit them to be better leaders among their own people. Thus, writing in his Journal, February, 1874, concerning his work with the theological class that winter, he said: I heard them a lesson every day,—one day in philosophy [physics] and the next in chemistry. I went thus over optics and mechanics, and reviewed electricity, and went through the volume on chemistry. I practically gave all my time to the business of teaching and experimenting, and getting apparatus. I had carpenters and tinners at work a good part of the time. I got up most of the things needed for illustrating mechanics, and a number in optics; also completed my set of fixtures for frictional electricity, and added a good number of articles to my set of galvanic apparatus. With my new battery I showed the electrical light and the deflagration of metals very well. The Ruhmkorff coil performed very well indeed, and made a fine display. I had an exhibition of two nights with the magic lantern, using the oxyhydrogen light. In chemistry I made all the gases and more than are described in the book, and experimented on them fully. They gave me no small amount of trouble, but I succeeded with them all very well. I made both light and heavy carbureted hydrogen, and experimented with them. Then I made coal gas enough to light up the room through the whole evening. Altogether I have made for the students a fuller course of experiments in philosophy or chemistry than I saw myself. They studied well and appreciated very much what they saw. I trust the issue will prove that my time has not been misspent. I have learned a great deal myself, especially in the practical part of experiment-making. It may be that I may yet have occasion to turn this knowledge to good account. I have also gathered in all a very good set of apparatus, which I shall try to make further use of.