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Updated: May 1, 2025
On the other hand, it had not harmed the horny flipper of the termite worker that had flicked it onto the garden slug. Did that mean that the flipper was immunized to the stuff, like the lining of the stomach, which is unharmed by acids powerful enough to decompose other organic master? Or did it mean that all horn was untouched by it? He groaned aloud.
Now men live upon it and cut streets in it and grow crops on it. So for many miles about, Vesuvius has been making earth. Her ashes lie hundreds of feet deep. Men dig wells and still find only material that has been thrown out of the volcano. When this matter grows old and lies under the sun and rain it turns to good soil. The acids of water and air and plants eat into it. Rain wears it away.
The soil moisture contained enough acid to neutralize the trace of alkali contained in the blue paper and to change the paper to a distinctly light red color; and the fact that the paper remains red even after drying, shows that the soil contains fixed acids or acid salts, and not merely carbonic acid, which if present would completely volatilize as the paper dries.
Surely there must be some scars left after such grafting. I picked up the various sets of prints. It was true that the third set was not very clear, but there certainly were no scars there. "Though there is no natural changeability of finger-prints," pursued Kennedy, "such changes can be induced, as Dr. Paul Prager of Vienna has shown, by acids and other reagents, by grafting and by injuries.
Heath Wilson, after careful examination, pronounces that not only time, but the wilful hand of man, re-painting and washing the delicate tint-coats with corrosive acids, has contributed to their ruin. Histoire de la Peinture en Italie, p. 332.
Every piece of animal flesh is saturated with these excrements of the cells in the form of uric acid and many other kinds of acids, alkaloids of putrefaction, xanthines, ptomaines, etc.
In order to form wireless waves we must have a frequency of at least one hundred thousand vibrations a second; and as it is out of the question to produce these by mechanical means we employ a group of Leyden jars. Such jars you have of course seen. They have in them two pieces of tinfoil separated by glass, which is a nonconductor of electric currents, and various other acids and minerals.
It should be used in cold, not too dilute, solutions. Its sensitiveness is lessened in the presence of considerable quantities of the salts of the alkalies. A !phenolphthalein solution! is prepared by dissolving 1 gram of the pure compound in 100 cc. of 95 per cent alcohol. This indicator is particularly valuable in the determination of weak acids, especially organic acids.
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