hould be dated and signed by those present when
completed. It is perhaps hardly necessary to remark that
precautions should be taken to prevent sudden intrusions, and as
far as possible to secure general quiet without.

I may here interject an observation which appears to me
suggestive and may prove valuable. It has been observed that the
inhabitants of basaltic localities are more generally natural
clairvoyants than others. Basalt is an igneous rock composed
largely of augite and felspar, which are silicate crystals of
calcium, potassium, alumina, etc., of which the Moonstone is a
variety. The connecting link is that clairvoyance is found to be
unusually active during and by means of moonlight. What
psycho-physical effect either basalt or moonlight has upon the
nervous system of impressible subjects appears to be somewhat
obscure, but there is little difference between calcium light and
moonlight, except that the latter is moderated by the greater
atmosphere through which it comes to us. It is only when we
come to know the psychological values of various chemical
bodies that we can hope for a solution of many strange phenomena
connected with the clairvoyant faculty. I recollect that the
seeress of Prevorst experienced positive pain from the near
presence of water during her abnormal phases. Reichenbach
found certain psycho-pathological conditions to be excited by
various metals and foreign bodies when brought into contact with
the sensitive. These observations are extremely useful if only in
producing an awareness of possible reasons for such disturbance
as may occur in the conditions already cited.

At the outset the sittings should not last longer than at most
half-an-hour, but it is important that they should be regular,
both as to time and place. We are already informed from a number of
observations that every action tends to repeat itself under similar
conditions. Habits of life and mind are thus formed so that in
time they become quite involuntary and automatic. A cumulative
effect is obtained by attention to this matter of periodicity, while
the use of the same place for the same purpose tends to dispose
the mind to the performance of particular functions. In striving
for psychic development of any sort we shall do well not to
disregard these facts. For since all actions tend to repeat
themselves and to become automatic, to pass from the domain of
the purposive into the habitual, the psychic faculties will