Hydrocarbons

Gentle Measures in the Management and Training of the Young
by Jacob Abbott

(Page 16 of 28)

This process may be greatly accelerated by heat. If a portion of the wood is raised in temperature to a certain point, the elements begin to combine with the oxygen near, with so much violence as to release the reserved power with great rapidity. And as this force re-appears in the form of heat, the next portions of the wood are at once raised to the right temperature to allow the process of reoxidation to go on rapidly with them. This is the process of combustion. Observations and experiments on decaying wood have been made, showing that the amount of heat developed by the combustion of a mass of wood, though much more intense for a time, is the same in amount as that which is set free by the slower process of re-oxidation by gradual decay; both being the equivalent of the amount absorbed by the leaves from the sun, in the process of deoxidizing the carbon and hydrogen when the wood was formed.

The force imprisoned in these unstable compounds may be held in reserve for an unlimited period, so long as all opportunity is denied them of returning the elements that compose them to their original combinations. Such a case occurs when large beds of vegetable substances are buried under layers of sediment which subsequently become stone, and thus shut the hydrocarbonaceous compounds beneath them from all access to oxygen. The beds of coal thus formed retain their reserved force for periods of immense duration; and when at length the material thus protected is brought to the surface, and made to give up its treasured power, it manifests its efficiency in driving machinery, propelling trains, heating furnaces, or diffusing warmth and comfort around the family fireside. In all these cases the heat and power developed from the coal is heat and power derived originally from the sun, and now set free, after having lain dormant thousands and perhaps millions of years.

This simple case of the formation of hydrocarbons from the elements furnished by carbonic acid and water is only adduced as an illustration of the general principle. The modes by which the power of the sun actually takes effect in the decomposition of stable compounds, and the formation of unstable ones from the elements thus obtained, are innumerable, and the processes as well as the combinations that result are extremely complicated. These processes include not only the first formation of the unstable compounds in the leaf, but also an endless series of modifications and re-arrangements which they subsequently undergo, as well in the other organs of the plant as in those of the animal when they are finally introduced into an animal system. In all, however, the general result is substantially the same - namely, the forcing of elements into unnatural combinations, so to speak, by the power of the sun acting through the instrumentality of vegetation, in order that they may subsequently, in the animal system, give out that power again by the effort they make to release themselves from the coercion imposed upon them, and to return to the natural unions in which they can find again stability and repose.

One of the chief elements employed in the formation of these weakly-combined substances is nitrogen - its compounds being designated as nitrogenous substances, and noted, as a class, for the facility with which they are decomposed. Nitrogen is, in fact, the great weak-holder of nature. Young students in chemistry, when they learn that nitrogen is distinguished by the weakness of its affinities for other elements, and its consequent great inertness as a chemical agent, are often astonished to find that its compounds - such as nitric acid, nitre, which gives its explosive character to gunpowder, nitro-glycerine, gun-cotton, and various other explosive substances which it helps to form - are among the most remarkable in nature for the violence and intensity of their action, and for the extent to which the principle of vitality avails itself of them as magazines of force, upon which to draw in the fulfillment of its various functions.

But this is really just what should be expected. It is the very weakness of the hold which nitrogen maintains upon the elements combined with it that facilitates their release, and affords them the opportunity to seize with so much avidity and violence on those for which they have a strong attraction.

It is as if a huntsman should conduct a pack of ferocious dogs into a field occupied by a flock of sheep, quietly grazing, holding the dogs securely by very strong leashes. The quiet and repose of the field might not be seriously disturbed; but if, on the other hand, a child comes in, leading the dogs by threads which they can easily sunder, a scene of the greatest violence and confusion would ensue.

In the same manner, when nitrogen, holding the particles of oxygen with which it is combined in the compounds above named by a very feeble control, brings them into the presence of other substances for which they have a very strong affinity, they release themselves at once from their weak custodian, and rush into the combinations which their nature demands with so much avidity as to produce combustions, deflagrations, and explosions of the most violent character.

The force which the elements display in these reunions is always - and this is one aspect of the great discovery of modern times in respect to the persistence or constancy of force which has already been referred to - precisely the same in amount as that which was required for dissevering them from their original combinations with such substances at some previous time. The processes of vegetation are the chief means employed for effecting the original separations, by the power of the sun, and for forming the unstable compounds by which this power is held in reserve. The animal system, on the other hand, takes in these compounds, remodels them so far as is required to adapt them to its structure, assimilates them, and then, as occasion requires quires, it releases the concealed force, which then manifests itself in the forms of animal heat, of muscular motion, and of cerebral and nervous power.

In what way, and to what extent, the knowledge of these truths should influence us in the management and training of children in respect to their extraordinary activity, is the question we have next to consider.

About the Author

Jacob Abbott (November 14, 1803 - October 31, 1879) was an American writer of children's books. He was a prolific author, writing juvenile fiction, brief histories, biographies, religious books for the general reader, and a few works in popular science. He died in Farmington, Maine, where he had spent part of his time after 1839.