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In what manner silex and carbonate of lime may become widely diffused in small quantities through the waters which permeate the earth's crust will be spoken of presently, when the petrifaction of fossil bodies is considered; but I may remark here that such waters are always passing in the case of thermal springs from hotter to colder parts of the interior of the earth; and, as often as the temperature of the solvent is lowered, mineral matter has a tendency to separate from it and solidify.
In the second place, is it probable that numerous bones not hardened by silex or any other mineral, could have retained their delicate prominences and surfaces perfect if they had been washed out of one deposit, and re-embedded in another: this later deposit being formed of large, hard pebbles, arranged by the action of currents or breakers in shallow water into variously curved and inclined layers?
Fourthly, The similar appearance of the epidermis of reeds, corn, and grasses, induced me to suppose that they also contained silex. By burning them carefully and analyzing their ashes, I found that they contained it in rather larger proportions than the canes. Fifthly. The corn and grasses contain sufficient potash to form glass with their flint.
Mineralization of Organic Remains. Impressions and Casts: how formed. Fossil Wood. Goppert's Experiments. Precipitation of Stony Matter most rapid where Putrefaction is going on. Sources of Lime and Silex in Solution.
Davy's reasoning, that a few years ago, after the burning of a large mow, in the neighbourhood of Bristol, a stratum of pure, compact, vitrified silex appeared at the bottom, forming one continuous sheet, nearly an inch in thickness. I secured a portion, which, with a steel, produced an abundance of bright sparks. Upon Mr.
We see the inorganic pass into the organic, we see iron and lime and potash and silex blush in the flowers, sweeten in the fruit, ripen in the grain, crimson in the blood, and we marvel not. We see the spotless pond-lily rising and unfolding its snowy petals, and its trembling heart of gold, from the black slime of the pond.
Pierre, however, noting here and there fragments of the Sacred Way, now turning, now running down, and now ascending with their pavement of silex indented by the chariot-wheels, thought of the triumphs, of the ascent of the triumpher, so sorely shaken as his chariot jolted over that rough pavement of glory.
"Sur l'un, la pierre puante fait un banc horizontal dans une montagne de pierre calcaire crystalline, ou d'une espèce de marbre, qui contient des couches et filons de métal. Ce banc de pierre puante y fait le toit d'une couche de galène de plomb et de pierre calaminaire, et dans ses cavités et fentes il y a non seulement des blocs de grandeur différente, mais aussi des veines et petites bandes courtes de silex, tant ordinaire, que noble c, a, d, de la pierre
When worms were kept in pots filled with fine ferruginous sand, it was manifest that the oxide of iron, with which the grains of silex were coated, had been dissolved and removed from them in the castings.
Chemical analysis shows the constituent parts of Egyptian glass to have been nearly identical with our own; but it contains, besides silex, lime, alumina, and soda, a relatively large proportion of extraneous substances, as copper, oxide of iron, and oxide of manganese, which they apparently knew not how to eliminate.
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