And here again another phenomenon presented itself. The images reflected (if the expression be allowable) in the verses rose bodily and with perfect distinctness before me, simultaneously with their verbal representations; and when I roused myself (I had not been _sleeping_, but was only _abstracted_) all remained clear and distinct in my memory. From that night for six months, darkness always brought the most horrible fancies, and opticular and auricular or acoustical delusions of a frightful nature, so vivid and real that instead of a blessing, sleep became a curse, and the hours of darkness became hours which seemed days of misery. For many consecutive nights I dared not undress myself nor put out the light, lest the moment I lay down some _"monstrum horrendum, informfe, ingens"_ should blast my sight with his hellish aspect! I had a double sense of sight and sound; one real, the other visionary; both equally strong and apparently real; so that while I distinctly heard imaginary footsteps ascending the stairs, the door opening and my curtains drawn, I at the same time as plainly heard any actual sound in or outside the house, and could not remark the slightest difference between them; and while I _saw_ an imaginary assassin standing by my bed, bending over me with a lamp in one hand and a dagger in the other, I could see any real tangible object which the degree of light which might be then in the room made visible. Though these visionary fears and imaginary objects had presented themselves to me every night for months, yet I never could convince myself of their non-existence; and every fresh appearance caused suffering of as intense and as deadly horror as on the first night! So great was the confusion of the real with the unreal that I nearly became a convert to Bishop Berkeley's non-reality doctrines. My health was also rapidly becoming worse; and before I had taken my opium in the morning I had become unable to move hand or foot, and of course could not rise from my bed until I had received strength from the "damnable dirt." I could not attend the office at all in the morning, and was forced to throw up my articles, and, as the only chance left me of gaining a livelihood, turn to writing for magazines for support. I left B. and proceeded to London, where I engaged with Charles Knight to supply the chapters on the use of elephants in the wars of the ancients for the "History of Elephants," then preparing for publication in the series of the Library of Entertaining Knowledge. For this purpose I obtained permission to use the library of the British Museum for six months, and again devoted myself with renewed ardor to my favorite studies.