You Cannot Get Away | My Web Site Page 358 Chapter 03 Page 06

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"My dear young lady--Miss Brooke--Dorothea!" he said, pressing her hand between his hands, "this is a happiness greater than I had ever imagined to be in reserve for me. That I should ever meet with a mind and person so rich in the mingled graces which could render marriage desirable, was far indeed from my conception. You have all--nay, more than all--those qualities which I have ever regarded as the characteristic excellences of womanhood. The great charm of your sex is its capability of an ardent self-sacrificing affection, and herein we see its fitness to round and complete the existence of our own. Hitherto I have known few pleasures save of the severer kind: my satisfactions have been those of the solitary student. I have been little disposed to gather flowers that would wither in my hand, but now I shall pluck them with eagerness, to place them in your bosom."

In the great majority of cases, the fusion of the metal is accompanied by reduction from the state of oxide; in these the slag should be basic. It is not easy to reduce the whole of a reducible oxide (say oxide of copper or of iron) from a slag in which it exists as a borate or silicate; there should be at least enough soda present to liberate it. When the object is to separate one metal, say copper, without reducing an unnecessary amount of another (iron) at the same time, a slag with a good deal of borax is a distinct advantage. The slag then will probably not be free from copper, so that it will be necessary to powder and mix the slag with some soda and a reducing agent, and to again fuse the slag in order to separate this residual metal. In all those cases in which the slag retains an oxide of a heavy metal, this cleaning of the slag is advisable, and in the case of rich ores necessary. Slags containing sulphides are especially apt to retain the more easily reducible metals.

~Charcoal.~--Powdered wood charcoal; it contains more or less hygroscopic moisture and about 3 or 4 per cent. of ash. The rest may be considered carbon. Carbon heated with metallic oxides takes the oxygen; at low temperatures it forms carbon dioxide, and at higher ones, carbon monoxide. Other conditions besides that of temperature have an influence in producing these results; and as the quantity of charcoal required to complete a definite reaction varies with these, it should be calculated from the results of immediate experience rather than from theoretical considerations. ~Flour.~--Ordinary wheat flour is convenient in use. On being heated it gives off inflammable gases which have a certain reducing effect, and a residue of finely divided carbon is left. It is likely to vary in the quantity of moisture it contains. Two parts of flour should be used where one part of charcoal would be otherwise required. ~Tartar.~--This is crude hydric potassic tartrate; the purified salt, cream of tartar, may be used. On being heated it gives off inflammable gases, and leaves a residue formed of potassic carbonate mixed with finely divided carbon. Five parts of tartar should be used in the place of one of charcoal.

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