DOCS.
270,
271
OCTOBER
1916 259
(E-1)
e
+
1/2
[o,
h]).
If
this
is incorporated
into
Maxwell’s
equations, you
obtain
Fizeau’s result
through
simple
calculation.[12]
I
don’t know
the
paper by Cailler;[13]
at
least,
I do not recall
having
read it.
If
you
have
it,
show
it
to
me
the
next time
I
visit
you
in Switzerland. Do also
look
after
my boys,
if
you conveniently
find time
for
it.[14]
What’s
Vero
doing?
When
is
he
going
to
fly
from
the
nest?[15]
Warm
regards,
yours,
Albert.
You’re
going
to
receive
a
small
paper
from
me soon on
the
basis of
the
general
theory
of
rel.,
in which
it
is
demonstrated
how
the
rel[ativity]
requirement
is
linked
with the
energy
principle.[16]
It’s
very amusing.
271. To Hans Albert
Einstein
[Berlin,
after
31
October
1916][1]
Dear
Albert,
I
am
very glad
that
all
three
of
you are
happily
together
again
now.[2] I
heard
from Mrs. Besso
that
you
supported
your
mother
like
a
grown man
in
the
difficult
times
now
behind
you
all.
This makes
me happy
and
proud;
it
is
not
through
joys
and
pleasantness
that
a
decent
fellow
develops,
but
through
suffering
and
injustice.
Your father’s
path
was
also not
always
strewn with
roses
like
now,
but rather
more
with thorns!
Just
have
your
mother
[tell]
you
about the
early
days
sometime. Also tell
me
about
Tete.
How
does
he
look? Go
out
with
him
frequently
into
the
fresh
air,
and
you
all should take his
temperature
often,
so
that
we can
take him
away
from Zurich
again right
away.
I
am
probably
coming
to
Switzerland in
July
and
going
somewhere at
high
altitude
to
relax.
There we’ll
be able
to
be
together
with
Tete; you
have
holidays
in
July, you
know.[3]
Do write
me
a
bit about
school,
music,
and whatever
else
you are doing,
whether
you
have made
a
closer
friendship
with
another
boy,
and
with
whom
else
you
are
associating.
You
are
now
at
an age
in which
the
most
important
impressions
of
life
are
made.
Later
it all
runs
off
you
like
water
off
a
crocodile’s
back. Write
me
back
soon
and
warm
regards
and
kisses
also
to
Tete from
your
Papa.
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