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He changed the turmeric for litmus paper, and placed it, not in connection with his conductor, but with his discharging train, a metallic point connected with the conductor being fixed at a couple of inches from the paper; on turning the machine, acid was liberated at the edges and corners of the litmus.
All acids contain one or more atoms of hydrogen capable of being replaced by metals, and when such hydrogen atoms are completely replaced by metals, there result so-called neutral or normal salts, that is, neutral substances having no action on litmus solution.
The one neutralizes the other. This test with litmus paper is a test for soil acidity, and the fact that the moisture of the soil has turned the litmus from blue to red shows that this soil is acid, or sour.
You can tell that better by the appearance of the plants which you find. Any druggist can furnish the litmus paper, and give you a demonstration of how it acts on contact with alkali. Using Gypsum for Alkali. Is it better, to kill the black alkali in the soil with gypsum, just to scatter it over an alkalied spot or to plow the soil first and then use the gypsum? I am going to sow alfalfa.
When the mixture in the bottle begins to turn blue, put in the end of a slip of litmus paper about half an inch deep, and then draw this end through your fingers, moistened with water. So long as the ends of the blue litmus paper become more or less reddened, the acids have not been completely saturated. Only when it remains blue, has the point of saturation been reached.
The preparation of a !solution of litmus! which is suitable for use as an indicator involves the separation from the commercial litmus of azolithmine, the true coloring principle. Soluble litmus tablets are often obtainable, but the litmus as commonly supplied to the market is mixed with calcium carbonate or sulphate and compressed into lumps.
Blue bice and ceruse, or ultramarine and white, shaded with indigo. Straw Colour. Masticot and a very little lake, shaded with Dutch pink. Yellow Colour. Indigo, white, and lake; or fine Dutch bice and lake, shaded with Indigo; or litmus smalt and bice, the latter predominant. Water. Blue and white, shaded with blue, and heightened with white. To prevent Colours from Cracking.
At short intervals, the liquid is tested by means of litmus paper, and when it shows a faint acid reaction, by turning the blue paper red, the addition of acid is stopped.
Posthypnotic suggestion, crystal-gazing, automatic writing and trance-speech, the willing-game, etc., are now, thanks to him, instruments of research, reagents like litmus paper or the galvanometer, for revealing what would otherwise be hidden. These are so many ways of putting the Subliminal on tap.
If some wool be placed in a dry glass tube, and heated strongly so as to cause destructive distillation, products containing much carbonate of ammonium are given off. The ammonia is easily detected by its smell of hartshorn and the blue colour produced on a piece of reddened litmus paper, the latter being a general test to distinguish alkalis, like ammonia, soda, and potash, from acids.
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