1. Mix and filter before using. In No. 786 will be found a simple developer for instantaneous pictures. 2. Directions for preparing sensitive paper will be found in Nos. 786 and 803. 3. Directions for polishing ferrotype plates will be found in Nos. 797 and 805. 4. A ruby light for dark-room work may be made by taking a wooden starch-box, cutting a square hole in the cover, and pasting two thicknesses of red fabric over the opening. A hole must be made in one end of the box—which answers for the top of the lantern—to allow for ventilation. This must be shielded so as to prevent the escape of actinic rays. This may be done by pieces of tin bent so that air can enter, but no white light escape. A candle should be used with this style of lantern. 5. Ammonia in its pure state is a gas which combines readily with water, water taking up of the gas five hundred times its own volume. This is liquid ammonia, or stronger water of ammonia. By diluting it with water it becomes the spirits of hartshorn, or ammonia water. 6. Bromide of ammonia is formed in the simplest manner by the addition of bromine to water of ammonia. It is very useful in photographic work. It gives great sensitiveness to gelatine and collodion emulsions—combined with pyro for a developer it prevents fog—and is employed in the preparation of sensitive papers.
This Department is conducted in the interest of Girls and Young Women, and the Editor will be pleased to answer any question on the subject so far as possible. Correspondents should address Editor.
Lillie M—— came to see me yesterday, and after she had gone, Maria G——, who was putting a new braid on my second-best gown, said:
"That Miss Lillie uses very nice perfumery. It's so faint and fine, not anything you can smell a long way off, but something which makes you think of roses or violets when she passes you on the street. How does she manage it?"
Maria G—— likes perfumes, but does not know how to use them.
"Not by putting cologne on her handkerchief," I answered, decidedly. "Nobody should carry about scents poured on their garments." I had to say this.