718. To stain paper or parchment Green.—Paper or parchment may be stained green by the solution of verdigris in vinegar, or by the crystals of verdigris dissolved in water; also by the solution of copper in aquafortis, made by adding filings of copper, gradually, to the aquafortis, till no ebullition ensues; or, the spirit of salt may be substituted for the aquafortis.
HOUSE-PLANTS.
719. Plants require much light and fresh air; a light garret is an excellent place for them; even those which will not bear the outer air, must have the air of the room frequently freshened by ventilation, to preserve them in health. They should not stand in a draught of air. In frosty weather the windows should be kept close, and at night, the shutters. In sharp frost, instead of stirring out the fire, leave a little on retiring to rest, with a guard before it for security.
As a general rule, never water plants while the sun shines. The time should be in the evening, or early in the morning, unless it be confined to watering the roots, in which case transplanted plants, and others in a growing state, may be watered at any time; and, if they are shaded from the sun, they may also be watered over the tops.
The water, if taken from a well or cold spring, should be exposed one day to the sun, otherwise it will chill the plants. A small quantity only should be applied at a time, that it may have the effect of refreshing rain.
Rain water is the best for plants; next river water; hard spring water is the worst.
720. To air Plants, and ventilate Rooms wherein they are contained.—Plants should have air, every day in the year, to make them grow well; but this matter, in sitting-rooms, will not of course be regulated for their sakes, especially in the colder seasons. Wherever placed, however, some attention should be paid to airing and ventilating the rooms regularly, by opening the windows, and occasionally the doors, in order to excite a free circulation of air. This should be done to a certain extent every day, according to the state of the weather, except in the time of severe frost, when it would not be advisable to admit external air. But at such times, if bad weather be of long continuance, the rooms may be ventilated by means of the doors, and by exciting a current of air in the passages, or other parts of the house.