But was it a hallucination? I turned round to look for the stalk, and I found it immediately under the bush, freshly broken, between two other roses which remained on the branch, and I returned home then, with a much disturbed mind; for I am certain now, as certain as I am of the alternation of day and night, that there exists close to me an invisible being that lives on milk and on water, which can touch objects, take them and change their places; which is, consequently, endowed with a material nature, although it is imperceptible to our senses, and which lives as I do, under my roof.... _August 7._ I slept tranquilly. He drank the water out of my decanter, but did not disturb my sleep. I ask myself whether I am mad. As I was walking just now in the sun by the river side, doubts as to my own sanity arose in me; not vague doubts such as I have had hitherto, but precise and absolute doubts. I have seen mad people, and I have known some who have been quite intelligent, lucid, even clear-sighted in every concern of life, except on one point. They spoke clearly, readily, profoundly on everything, when suddenly their thoughts struck upon the breakers of their madness and broke to pieces there, and were dispersed and foundered in that furious and terrible sea, full of bounding waves, fogs and squalls, which is called _madness_. I certainly should think that I was mad, absolutely mad, if I were not conscious, did not perfectly know my state, if I did not fathom it by analyzing it with the most complete lucidity. I should, in fact, be a reasonable man who was laboring under a hallucination. Some unknown disturbance must have been excited in my brain, one of those disturbances which physiologists of the present day try to note and to fix precisely, and that disturbance must have caused a profound gulf in my mind and in the order and logic of my ideas. Similar phenomena occur in the dreams which lead us through the most unlikely phantasmagoria, without causing us any surprise, because our verifying apparatus and our sense of control has gone to sleep, while our imaginative faculty wakes and works. Is it not possible that one of the imperceptible keys of the cerebral finger-board has been paralyzed in me? Some men lose the recollection of proper names, or of verbs or of numbers or merely of dates, in consequence of an accident. The localization of all the particles of thought has been proved nowadays; what then would there be surprising in the fact that my faculty of controlling the unreality of certain hallucinations should be destroyed for the time being! I thought of all this as I walked by the side of the water. The sun was shining brightly on the river and made earth delightful, while it filled my looks with love for life, for the swallows, whose agility is always delightful in my eyes, for the plants by the riverside, whose rustling is a pleasure to my ears.