ils; place them in the middle
of the wall, the thin end of the shingle down. That gives them a bevel
and can be easily raised with the boxes. To tie the wall together, at
every third course place strips of boards a little shorter than the
thickness of the wall; cut notches in each so that the concrete will
fill in, holding all fast. The side walls being up, place two inch
planks on top of the wall upon which to rest the upper joists, put on
joist and rafters, remove the box plank, take inch boards for boxes,
cut to fit between joists and rafters, and fill with concrete to upper
side of rafters, which makes walls that will keep out cold and damp,
all kinds of vermin, and a roof which nothing but a cyclone can
remove. In making door and window frames, make the jambs two inches
narrower than the thickness of the walls, nailing on temporary two
inch strips.

Make the mortar bed large enough to hold the material for one course;
put in unslaked quicklime in proportion to 1 to 20 or 30 of other
material; throw into it plenty of water, and don't have that
antediluvian idea that you can drown it; put in clean sand and gravel,
broken stone, making it thin enough, so that when it is put into boxes
the thinner portion will run in, filling all interstices, forming a
solid mass. A brick trowel is necessary to work it down alongside the
boxing plank. One of the best and easiest things to carry the concrete
to the boxes is a railroad wheelbarrow, scooping it in with a scoop
shovel. Two courses a week is about as fast as it will be safe to lay
up the walls.

* * * * *

The _Medical Summary_ recommends the external use of buttermilk to
ladies who are exposed to tan or freckles.

* * * * *

WHAT CAUSES PAINT TO BLISTER AND PEEL?

HOW TO PREVENT IT.

This subject has been treated by many, but out of the numerous ideas
that have been brought to bear upon it, the writers have failed to
elucidate the question fully, probably owing to the fact that in most
parts they were themselves dubious as to the real cause. Last year
W.S. gave a lengthy description in the _Building News_, in which he
classified blistering and peeling of paint into one of blistering
only. He stated in the beginning of his treatise the following:

"The subject of blistering of paint has from time to time engrossed
the attention of practical men; but so far as we can follow it in the
literature