When a man uses any part of his mental body it not only vibrates for the
time more rapidly, but it also temporarily swells out and increases in
size. If there is prolonged thought upon a subject this increase becomes
permanent, and it is thus open to any man to increase the size of his
mental body either along desirable or undesirable lines.

Good thoughts produce vibrations of the finer matter of the body, which by
its specific gravity tends to float in the upper part of the ovoid; whereas
bad thoughts, such as selfishness and avarice, are always oscillations of
the grosser matter, which tends to gravitate towards the lower part of the
ovoid. Consequently the ordinary man, who yields himself not infrequently
to selfish thoughts of various kinds, usually expands the lower part of his
mental body, and presents roughly the appearance of an egg with its larger
end downwards. The man who has repressed those lower thoughts, and devoted
himself to higher ones, tends to expand the upper part of his mental body,
and therefore presents the appearance of an egg standing on its smaller
end. From a study of the colours and striations of a man's mental body the
clairvoyant can perceive his character and the progress he has made in his
present life. From similar features of the causal body he can see what
progress the ego has made since its original formation, when the man left
the animal kingdom.

When a man thinks of any concrete object--a book, a house, a landscape--he
builds a tiny image of the object in the matter of his mental body. This
image floats in the upper part of that body, usually in front of the face
of the man and at about the level of the eyes. It remains there as long as
the man is contemplating the object, and usually for a little time
afterwards, the length of time depending upon the intensity and the
clearness of the thought. This form is quite objective, and can be seen by
another person, if that other has developed the sight of his own mental