before described after agitating the bottle, it may be concluded that the
water is thoroughly saturated with sulphurous acid and is strong enough for
immediate use. More gas can be generated by adding more dilute sulphuric
acid to the hypo until the latter is decomposed; then it should be thrown
aside, and a fresh charge put in the bottle. On preparing the solution it
is well to set the bottles on the outside ledge of the window, or in some
other open situation where no inconvenience will result from the escape of
the excess of sulphurous gas as it bubbles through the water.

The solution of sulphurous acid, if preserved at all, ought to be kept in
small bottles, completely filled and perfectly closed; but as it is very
easy to saturate a considerable quantity of water with sulphurous acid gas
in a short time, there is but little inducement to use a solution which may
possibly have become weakened by keeping.

Care should be taken not to add too much dilute acid to the hypo at a time,
else excessive effervescence will occur, and the solution will froth over
the top of the bottle.

* * * * *




THE NATIONAL MONUMENT AT ROME.


About three years ago the Italian Government invited the architects and
artists of the world to furnish competitive designs for a national monument
to be erected to the memory of King Victor Emanuel II. at Rome. More than