The case given in Appendix VI. E is interesting, both evidentially and from its intrinsic character. The narrative, printed in _Phantasms of the Living_, on the authority of one only of the witnesses concerned, led to the discovery of the _second_ witness--whom we had no other means of finding--and has been amply corroborated by her independent account. The case stands about midway between psychorrhagic cases and intentional self-projections, and is clearly of the nature of an _invasion_, since the phantasm was seen by a stranger as well as by the friend, and seemed to both to be moving about the room. The figure, that is to say, was adapted to the percipient's environment. Cases of this general character, both visual and auditory, occupy a great part of _Phantasms of the Living_, and others have been frequently quoted in the S.P.R. _Journal_ during recent years.[123] Of still greater interest is the class which comes next in order in my ascending scale of apparent _intensity_; the cases, namely, where there is recollection on both sides, so that the experience is _reciprocal_.[124] These deserve study, for it is by noting under what circumstances these spontaneously reciprocal cases occur that we have the best chance of learning how to produce them experimentally. It will be seen that there have been various degrees of tension of thought on the agent's part. And here comes in a small but important group--the group of what I may call death-compacts prematurely fulfilled. We shall see in the next chapter that the exchange of a solemn promise between two friends to appear to one another, if possible, after death is far from being a useless piece of sentiment. Such posthumous appearances, it is true, may be in most cases impossible, but nevertheless there is real ground to believe that the previous tension of the will in that direction makes it more likely that the longed-for meeting shall be accomplished. If so, this is a kind of _experiment_, and an experiment which all can make. Now we have two or three cases where this compact has been made, and where an apparition has followed--but before and not after the agent's death--at the moment, that is to say, of some dangerous accident, when the sufferer was perhaps all but drowned, or was stunned, or otherwise insensible.[125]