derably. It is generally between 100 and 325 pounds. As
much as 750 pounds per square inch has been measured, and in many
cases the actual pressure is even greater than this, but, as a rule,
it is not permitted to much exceed 20 atmospheres in any receiver or
pipe. The best investment for parties of small means that we know of
is in town lots in North Baltimore, Ohio. It is on the main line
of the B. & O. Railroad and the center of the oil and natural gas
discoveries in Ohio. Property is bound to double in value. For further
information, address, W.A. Rhodes, North Baltimore, Ohio.

Hints on House Building.--Gas pipes should be run with a continuous
fall towards the meter, and no low places. The gas meter should be
set in a cool place, to keep it from registering against you; but if
a "water meter," it should be protected from freezing. Cupboards,
wardrobes, bookcases, etc., generally afford receptacles for dust
on their tops. This may be avoided by carrying them clear up to the
ceiling. When this is not done, their tops should be sheeted over
flush with the highest line of their cornices, so that there may be no
sunken lodging-place for dust. Furring spaces between the furring and
the outer walls should be stopped off at each floor line with brick and
mortar "fire stops;" and the same with hollow interior partition walls.
Soil pipes should never have "T" branches; always curves, or "Y"
branches. Water pipes should be run in a continuous grade, and have a
stop and waste cock at the lowest point, so as to be entirely emptied
when desired. Furnaces should have as few joints as possible, and the iron
fire-pot is better lined with fire-brick. There should be no damper in
the smoke pipe; but the ash-door should shut air-tight when desired.
There should be provision for the evaporation of water in the hot-air
pipe. "Air boxes" should never be of wood. All air boxes should be
accessible from one end to the other, to clean them of dust, cobwebs,
insects, etc. Horizontal hot-air flues should not be over 15 feet
long. Parapets should be provided with impervious coping-stones to
keep water from descending through the walls. Sewer pipes should not
be so large as to be difficult to flush. The oval sections (point
down) are the best. Soil-pipes should have a connection with the upper
air, of the full diameter of the pipe to be ventilated. Stationary
wash-tubs of wood are apt to get soaked up with organic matter and
filth. Stationary