In another dream of the same type I imagined that I was with a dentist who was about to extract a tooth from a patient. Before applying the forceps he remarked to me (at the same time setting fire to a perfumed cloth at the end of something like a broomstick, in order to dissipate the unpleasant odour) that it was the largest tooth he had ever seen. When extracted I found that it was indeed enormous, in the shape of a caldron, with walls an inch thick. Taking from my pocket a tape measure (such as I carried in waking life), I found the diameter to be not less than twenty-five inches; the interior was like roughly-hewn rock, and there were sea-weeds and lichen-like growths within. The size of the tooth seemed to me large, but not extraordinarily so. It is well known that pain in the teeth, or the dentist's manipulations, cause those organs to seem of extravagant extent; in dreams this tendency rules unchecked; thus a friend once dreamed that mice were playing about in a cavity in her tooth. But for the dream just quoted, there was no known dental origin; it arose solely or chiefly from a walk during the previous afternoon among the rocks of the Cornish coast at low tide, and the fantastic analogy, which had not occurred to waking consciousness, suggested itself during sleep. In another dream, illustrating the same kind of confusion of images having a real resemblance unnoticed in waking life, I seemed to see on a table a small hand-gong of a common type, struck by a hammer, but on striking it repeatedly, it produced flashes of light instead of the sounds normally produced by a gong. I concluded that the instrument must be out of order and called some one to attend to it, whereupon we proceeded to deal with it as though it were a diminutive battery of the kind used to work electric bells. The gong was one familiar to me at the time in daily life; on the previous day I had casually observed that it was misplaced. In my dream I discovered a resemblance which actually exists between a gong of the type in question and the lever-handle for turning on the electric light, soothing a certain doubt by saying to myself in my dream that the instrument served both for the production of sound and of light. This link of connection led to the association of an electric battery with the hand-gong, as well as to the attribution to the gong of light-giving properties.[32]