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Updated: June 27, 2025
And if I know that the name gold stands for this complex idea of body, yellow, heavy, fusible, malleable, it will not much instruct me to put it solemnly afterwards in a proposition, and gravely say, all gold is fusible.
I had given almost three quarto pages upon that subject, endeavouring to explain how all the different degrees of infusibility were produced, by means of heat and distillation, in strata which had been originally more or less oily, bituminous, and fusible; and now our author says, that it is incomprehensible to him, how coal, an infusible substance, could be spread into strata by mere heat.
As a general rule, quartz, in a compact or amorphous state, forms a vitreous mass, serving as the base in which feldspar and mica have crystallised; for although these minerals are much more fusible than silex, they have often imprinted their shapes upon the quartz. This fact, apparently so paradoxical, has given rise to much ingenious speculation.
In questions relating to the world above; many may be seduced from their convictions by interest, or forced into apostasy by violence. Human nature is often malleable or fusible, where religious interests are concerned, but in affairs material and financial opposition to tyranny is apt to be unanimous.
Physical Geology is full of such selections of the picking out of the soft from the hard, of the soluble from the insoluble, of the fusible from the infusible, by natural agencies to which we are certainly not in the habit of ascribing consciousness. But that which wind and sea are to a sandy beach, the sum of influences, which we term the "conditions of existence," is to living organisms.
Could we begin at the other end, and discover what it was wherein that colour consisted, what made a body lighter or heavier, what texture of parts made it malleable, fusible, and fixed, and fit to be dissolved in this sort of liquor, and not in another; if, I say, we had such an idea as this of bodies, and could perceive wherein all sensible qualities originally consist, and how they are produced; we might frame such abstract ideas of them as would furnish us with matter of more general knowledge, and enable us to make universal propositions, that should carry general truth and certainty with them.
A fusible substance, or mineral composition in a fluid state, is emitted from those places of the earth at which subterraneous fire and expansive force are manifested in those eruptive operations. In examining these emitted bodies, men of science find a character for such productions, in generalising the substance, and understanding the natural constitution of those bodies.
Thus, my Child, the Ancients took care to conceal the name of the Stone; now let us return to our purpose. You have now Saturn wash'd and cleansed from all its impurity, and made as white as Snow, fusible as Wax, but is it not fix'd yet; we will make it fix the Mercury and Sulphur with its Earth.
We may now proceed to consider sulphureous substances, with regard to their solubility in water, and to the part which these bodies have acted in consolidating the strata of the globe. The sulphureous substances here meant to be considered, are substances not soluble in, water, so far as we know, but fusible by heat, and inflammable or combustible by means of heat and vital air.
Lead glass is softer and more readily fusible than soda glass, but has the disagreeable property of growing black in a few seconds unless worked in a strong oxidizing flame. This may be prevented by using a "hissing" flame, with a large excess of air, and working in the extreme end of the flame; or the black lead formed may thus be reoxidized, and the glass restored to its original clearness.
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