On the other hand, a comparison of the present case with those previously mentioned, fails to throw any light on the important question whether the deceased feels any consciousness of the action which the percipient sees, or whether what is seen is like a sort of photograph impressed upon the atmosphere of a particular locality, and visible only to certain persons, who are able to sense etheric wave-lengths which are outside the range of the single octave forming the solar spectrum. It throws no light on this question, because, in the case of my being seen by Mr. S. in Edinburgh and that of Miss B. and her mother being seen by me at Norwood, none of us were conscious of having been at those places; while in the case of my psychic visit to Lanercost Abbey, and other similar experiences I have had, I have been fully aware of seeing the places in question. The evidence tells both ways, and I can therefore only infer that there are two modes of psychic action, in one of which the person projecting that action, whether voluntarily or involuntarily, experiences corresponding sensations, and the other in which he does not; but I am unable to offer any criterion by which the observer can, with certainty, distinguish between the two. It appears to me, that such instances as those I have mentioned, point to ranges of etheric action beyond those ordinarily recognized by physical science, but the principle seems to be the same, and it is for this reason that I have taken the modern scientific theory of etheric vibration as our starting-point. The universe is one great whole, and the laws of one part cannot contradict those of another; therefore the explanation of such queer happenings is not to be found by denying the well-ascertained laws of Nature on the physical plane, but by considering whether these laws do not extend further. It is on this account that I would lay stress on the Mathematical side of things, and have adduced instances where various discoveries have been made by following up the sequence indicated by the laws already known, and which have thus enabled us to fill up gaps in our knowledge, which would otherwise stop, or at least seriously hinder, our further progress. It is in this way that Jachin helps Boaz, and that the undeviating nature of Law, so far from limiting us, becomes our faithful ally if we will only allow it to do so.