Lab
Library
Journal
Shop
Sign in
to keep
Share image
1
177
The Story of Alchemy and the Beginnings of Chemistry
·
M. M. Pattison Muir
146
When
two
elements
unite
in
different
proportions,
by
weight,
to
form
more
than
one
compound,
Dalton
supposed
that
(in
most
cases
at
any
rate)
one
of
the
compounds
is
formed
by
the
union
of
a
single
atom
of
each
element;
the
next
compound
is
formed
by
the
union
of
one
atom
of
the
element
which
is
present
in
smaller
quantity
with
two,
three,
or
more,
atoms
of
the
other
element,
and
the
next
compound
is
formed
by
the
union
of
one
atom
of
the
first
element
with
a
larger
number
(always,
necessarily,
a
whole
number)
of
atoms
of
the
other
element
than
is
contained
in
the
second
compound;
and
so
on.
From
this
assumption,
and
the
Daltonian
conception
of
the
atom,
it
follows
that
the
quantities
by
weight
of
one
element
which
are
found
to
unite
with
one
and
the
same
weight
of
another
element
must
always
be
expressible
as
whole
multiples
of
one
number.
For
if
two
elements,
A
and
B,
form
a
compound,
that
compound
is
formed,
by
supposition,
of
one
atom
of
A
and
one
atom
of
B;
if
more
of
B
is
added,
at
least
one
atom
of
B
must
be
added;
however
much
of
B
is
added
the
quantity
must
be
a
whole
number
of
atoms;
and
as
every
atom
of
B
is
the
same
in
all
respects
as
every
other
atom
of
B,
the
weights
of
B
added
to
a
constant
weight
of
A
must
be
whole
multiples
of
the
atomic
weight
of
B.
Marker
Marker
Fine marker
White-out
Fine white-out
Circle
Paint
Unmarker
Hand
Scalpel
Dice
Sieve
Purify
Undo
Redo
Start over
