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177
The Story of Alchemy and the Beginnings of Chemistry
·
M. M. Pattison Muir
14
[3]
See
the
chapter
Molecular
Architecture
in
the
Story
of
the
Chemical
Elements.
Lucretius
pictured
a
solid
substance
as
a
vast
number
of
atoms
squeezed
closely
together,
a
liquid
as
composed
of
not
so
many
atoms
less
tightly
packed,
and
a
gas
as
a
comparatively
small
number
of
atoms
with
considerable
freedom
of
motion.
Essentially
the
same
picture
is
presented
by
the
molecular
theory
of
to-day.
To
meet
the
objection
that
atoms
are
invisible,
and
therefore
cannot
exist,
Lucretius
enumerates
many
things
we
cannot
see
although
we
know
they
exist.
No
one
doubts
the
existence
of
winds,
heat,
cold
and
smells;
yet
no
one
has
seen
the
wind,
or
heat,
or
cold,
or
a
smell.
Clothes
become
moist
when
hung
near
the
sea,
and
dry
when
spread
in
the
sunshine;
but
no
one
has
seen
the
moisture
entering
or
leaving
the
clothes.
A
pavement
trodden
by
many
feet
is
worn
away;
but
the
minute
particles
are
removed
without
our
eyes
being
able
to
see
them.
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