ed from a pendulum free to swing in a rotary
path. In these ways a most wonderful series of drawings have been
obtained, and the similarity of these to some of the thought-forms is
remarkable; they suffice to demonstrate how readily vibrations may be
transformed into figures. Thus compare fig. 4 with fig. 12, the mother's
prayer; or fig. 5 with fig. 10; or fig. 6 with fig. 25, the serpent-like
darting forms. Fig. 7 is added as an illustration of the complexity
attainable. It seems to us a most marvellous thing that some of the
drawings, made apparently at random by the use of this machine, should
exactly correspond to higher types of thought-forms created in
meditation. We are sure that a wealth of significance lies behind this
fact, though it will need much further investigation before we can say
certainly all that it means. But it must surely imply this much--that,
if two forces on the physical plane bearing a certain ratio one to the
other can draw a form which exactly corresponds to that produced on the
mental plane by a complex thought, we may infer that that thought sets
in motion on its own plane two forces which are in the same ratio one to
the other. What these forces are and how they work remains to be seen;
but if we are ever able to solve this problem, it is likely that it
will open to us a new and exceedingly valuable field of knowledge.

[Illustration: FIGS. 4-7. FORMS PRODUCED BY PENDULUMS]

GENERAL PRINCIPLES.

Three general principles underlie the production of all thought-forms:--

1. Quality of thought determines colour.

2. Nature of thought determines form.

3. Definiteness of thought determines clearness of outline.

THE MEANING OF THE COLOURS

The table of colours given in the frontispiece has already been
thoroughly described in the book _Man Visible and Invisible_, and the
meaning to be attached to them is just the same in the thought-form as
in the body out of which it is evolved. For the sake of those who have
not at hand the full description given in the book just mentioned, it
will be well to state that black means hatred and malice. Red, of all
shades from lurid brick-red to brilliant scarlet, indicates anger;
brutal anger will show as flashes of lurid red from dark brown clouds,
while the anger of "noble indignation" is a vivid scarlet, by no means
unbeautiful, though it gives an unpleasant thrill; a particularly dark
and unpleasant red, almost exactly the colour called d