These instances will be sufficient for our purpose. We have given them as fair average examples of many others. If any reader still supposes that these effects have all been mere acting and falsehood, we must leave that reader to see and examine for himself as we have done.[4] For other readers who admit _the facts_ and want an explanation, we proceed to discuss the _modus operandi_. In the first place, then, we assert that _there is no proof whatever_ that these effects depend upon any electric influence: there is absolutely no evidence that the metallic disk, as an '_electric_' agent, has any connection with the results. On this point, we invite the lecturers and experimenters who maintain that electricity is the agent in their process, to test the truth of our assertion, as they may very easily. _Coeteris paribus_--all the other usual conditions being observed, such as silence, the fixed gaze, monotony of attention--let the galvanic disk be put aside, and in its place let a sixpence or a fourpenny-piece be employed, or indeed any similar small object on which the eyes of the patient must remain fixed for the usual space of time, and we will promise that the experiments thus made shall be equally successful with those in which the so-called galvanic disk is employed. The phenomena are physiological and not electrical. Our conviction is, that the results proceed entirely from _imagination acting with a peculiar condition of the brain_, and that this peculiarly passive and impressible condition of the brain is induced by the _fixed gaze_ upon the disk. These are the only agencies which we believe to be necessary, in order to give us an explanation of the phenomena in question. In saying so, however, we are aware that such data will seem to some inquirers insufficient to account for the effects we have described. It may be said: 'We know that imagination sometimes produces singular results, but can hardly see how it explains the facts stated.' We have only to request that such inquirers, before they throw aside our explanation, will give attention to a few remarks on the power of imagination in certain conditions. We propose, _1st_, To give some suggestions on this point; _2d_, To notice the relations of imagination with reason; and, _3d_, To inquire how far the physical means employed--the fixed gaze on the disk--may be sufficient to affect the mental organ, the brain, so as to alter its normal condition.