Much of our memory also takes the form of images

Much of our memory also takes the form of images. The face of a friend,
the sound of a voice, or the touch of a hand may be recalled, not as a
mere fact, but with almost the freshness and fidelity of a percept. That
much of our memory goes on in the form of ideas instead of images is
true. But memory is often both aided in its accuracy and rendered more
vital and significant through the presence of abundant imagery.

'----the sea that sinks and shelves,

But ourselves,
That rook and rise
With endless and uneasy motion,
Now touching the very skies,
Now sinking into the depths of ocean
'----the sea that sinks and shelves,
But ourselves,
That rook and rise
With endless and uneasy motion,
Now touching the very skies,
Now sinking into the depths of ocean.'

2

2. The pressures in the Earth increase from zero at the surface
to the order of 3,000,000 atmospheric pressures at the center.
We know that rock structure, or iron or other metals, can be
slightly compressed by pressure, but the experiments at very
high pressures, notably those conducted by Bridgman, give no
indications that matter under such pressures breaks down and
obeys different or unknown laws. It should be said, however,
that laboratory pressure-effects alone are not a safe guide as
to conditions within the Earth, where high pressures are
accompanied by high temperature. Unfortunately it has not been
found possible to combine the high-temperature factor with the
high-pressure factor in the laboratory experiments. It is well
known that the melting points of metals, including rocks,
increase with increase of pressure; and although the
temperatures in the Earth"s interior are very high, it is easy
to conceive that the materials of the Earth"s interior are
nevertheless in the solid state, or that they act like solids,
because of the high pressures to which they are subjected.