But why does the simple fact that we are standing before the public produce such disquietude within us? Why is it followed by such a far-reaching disturbance of the organic functions? We say it is the nerves, the brain, anxiety, the physical nature of man which we cannot control. But there is confusion also in our ideas. What is this much-praised force of will, this power of the soul which makes us so bold when alone and yet so cowardly before the eyes of a few people? I confess the problem is difficult, and I believe the easiest way to a partial solution is to analyse without prejudice what we all know about cerebral activity, and to see what physiologists have discovered in studying the emotions and the physical phenomena of thought. III Before, however, entering the field of experimental physiology, I allow myself the following remarks. In strict justice the names of many physiologists should be repeatedly mentioned, but I prefer to do so only from time to time, as I fear the interruption of the sentence by names and notes might be tiresome to those whose eye is unaccustomed to the perusal of scientific books, nor do I think there are many who would be curious to know the paternity of every assertion I shall make use of. In order, however, that no undeserved merit may be ascribed to me, I shall, without further ceremony, write in the first person only when an experience or an idea of my own is to be communicated, so that, if I shall be at fault, science may not be held responsible for a personal error.