How to A IB a Boon. It is the gen
eral practice to open only the lower
part ol the wludowa of a room In
ventilating it, whereas, if the upper
part weie also opened, the object
would De more esptcuy effected. Ibe
air in an apartment is usually heat!
to a higher lempeiature than the
outer air, and n is thus rendered
tghter; and as ibe outer air rushes
in, the warmer and lighter air is forc
ed upward, and nudiug xo outlet, it-
uaiua In ihe room. Ji a rauu.e be
held in ibe doorway, it will be lound
that tLe flan e will oe blown inward;
but it rais. d nearly to ibe t"P of the
uooiwav, it will to lutward: the
w at in air flowing out at the lop. while
the cold a-r flow a in at the bottom. A
utiirehtol warm air Irom the room
is generally rushing up the tt ie of ibe
liaiuej',U the nun be tpeo, even
though there should be no lire in the
stuve; thtieioie open fiie-olaces are
the best eiitiiaiora we can nave for a
chamber, with au opening arranged
iu the chimney irum the celling.
