235 / 330
600
MISCELLANEOUS
VALUABLE
RECEIPTS.
235
roofs
of
houses,
&c.
It
will
in
a
few
weeks
become
aa
hard
as
a
stone.
No.
510.
Water-Proof
.and
Fire-Proof
Cement
for
Roofs
of
Houses.
Slake
stone-lime
in
a
large
tub
or
barrel
with
boiling
water,
covering
the
tub
or
barrel
to
keep
in
the
steam.
When
thus
slaked,
pass
6
quarts
through
a
fine
sieve
:
it
will
then
be
in
a
state
of
fine
flour.
To
this
add
1
quart
rock-salt,
and
1
gallon
water.
Boil
the
mixture,
add
1
pound
alum
and
\
pound
copperas;
by
slow
degrees
add
j
pound
potash,
and
4
quarts
fine
sand
or
wood-ashes,
sifted.
Both
of
the
above
will
admit
of
an)^
colouring
you
please.
It
looks
better
than
paint,
and
is
as
durable
as
slate.
No.
511.
To
cure
Rancid
BatUr.
A
writer
in
the
"Journal
of
Industrial
Progress"
recommends
that
butter
should
be
kneaded
with
fresh
milk,
and
then
with
pure
w^ater.
He
states
that
by
this
treatment
the
butter
is
rendered
as
fresh
and
pure
in
flavour
as
wdien
recently
made.
He
ascribes
this
result
to
the
fact
that
butyric
acid,
to
w^hich
the
rancid
taste
and
odour
are
owing,
ia
readily
soluble
in
fresh
milk,
and
thus
removed.
No.
512.
How
to
improve
had
Butter.
Bad
butter
may
be
improv^ed
greatly
by
dissolving
It
thoroughly
in
hot
water
;
let
it
cool,
then
skim
it