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Updated: May 16, 2025
When vegetable matter is excluded from air and under great pressure, it decomposes slowly, parting with carbonic acid gas; and is first changed into lignite or brown coal, and then into bituminous coal, or the soft coal that burns with smoke and flame. I have been in a coal-mine where the carbonic acid gas, pouring from a crevice in the coal, put out a lighted candle.
In the presence of air this ferment oxidizes sugar by bringing oxygen to bear upon it; in the absence of air it decomposes the sugar by taking away oxygen from one group of atoms of the molecule of sugar and bringing it to act upon other atoms; on the one hand yielding a product of alcohol by reduction, on the other hand a product of carbonic acid gas by oxidation."
The other, on the contrary, is of very low tension, remains upon the wires sometimes half a minute, produces magnetism, decomposes chemicals, deflects the needle, and is capable of being used for telegraphic purposes, although, of course, imperfectly.
It is an almost universal fallacy to blame the desert for this state of affairs; to insinuate, for example, that even as it disintegrates the mountains into sand, so it decomposes the intellectual fabric of mankind, his synthesizing faculty, into its primordial elements of ecstasy and emotionalism. This is merely reaction: the desert's revenge.
A knell began to ring in that distance which Ramuntcho saw whitening; very slowly, the old belfry gave its voice, once more, for the end of a life; someone was in the throes of death on the other side of the frontier, some Spanish soul over there was going out, in the pale morning, under the thickness of those imprisoning clouds and he had almost the precise notion that this soul would very simply follow its body in the earth which decomposes
It is however the safest way not to eat any of these plants until they have been soaked in vinegar. Spirit of wine, and ether, extract some part of their poison; and tanning matter decomposes the greatest part of it. These are kown to be poisonous.
He recommends, as a judicious use of "the degree of liberty left to our intelligence by the end and purpose of positive science," that we should accept as a convenient generalization the doctrine that all chemical composition is between two elements only; that every substance which our analysis decomposes, let us say into four elements, has for its immediate constituents two hypothetical substances, each compounded of two simpler ones.
The deposition of a metal from a solution of its salt is very easily shown in the case of copper. In fact, we have already seen that in the Daniell cell the current decomposes a solution of sulphate of copper and deposits the pure metal on the copper plate.
The carbon dioxide absorbed from the air by distilled water decomposes the salt, with the separation of sulphur. The starch solution for use as an indicator must be freshly prepared. A soluble starch is obtainable which serves well, and a solution of 0.5 gram of this starch in 25 cc. of boiling water is sufficient. The solution should be filtered while hot and is ready for use when cold.
Suppose that the application of a certain quantity of heat to a body merely increases its bulk, that a double quantity melts it, and a triple quantity decomposes it: these three effects being heterogeneous, no ratio, whether corresponding or not to that of the quantities of heat applied, can be established between them.
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