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Particles of stone worn or triturated in the gizzards of worms Swallowed stones serve as mill-stones The levigated state of the castings Fragments of brick in the castings over ancient buildings well rounded. The triturating power of worms not quite insignificant under a geological point of view.
"Might make 'em into a sort of sanitary brick," he reflected over his cigar end. "Or a friable biscuit. Why NOT? You might advertise: 'Why are Birds so Bright? Because they digest their food perfectly! Why do they digest their food so perfectly? Because they have a gizzard! Why hasn't man a gizzard? Because he can buy Ponderevo's Asphalt Triturating, Friable Biscuit Which is Better."
The question as to whether the stomach acted as a grinding or triturating organ, rather than as a receptacle for chemical action, had been settled by Reaumur and was no longer a question of general dispute.
The resulting "concentrates" are washed off from time to time and reserved for secondary treatment. To begin with, they are roasted to get rid of the sulphur, arsenic, etc., which would interfere with the amalgamation or lixiviation, and then either ground to impalpable fineness in one of the many triturating pans with mercury, or treated by chlorine or potassium cyanide.
Birds of prey, and others subsisting mostly or entirely on animal food, have thin, membranous, and comparatively flabby gizzards; while those living on hard grains and seeds have extremely thick, powerful, and muscular ones, those capable of crushing up and thoroughly triturating all the food they take into their crops. These gizzards are nature's gristmills, and they grind exceedingly fine.
The Grusonwek Ball Mills, made by Krupp of Germany, also that made by the Austral Otis Company, Melbourne, are fast and excellent crushing triturating appliances for either wet or dry working, but are specially suited only for ores when the gold is fine and evenly distributed in the stone.
I was lately consulted with respect to the treatment of a pyritic ore in a very promising mine, but could not recommend the above treatment, because though the pyrites in the gangue was similar, the bulk of the lode consisted of silica, consequently there would be a great waste of power in triturating the whole of the stuff to what, with regard to much of it, would be an unnecessary degree of fineness.
There the matter might have rested but for the new Revelation, which prompted the sturdy stranger to investigate the composition of the article tendered. He took out one match and examined it carefully. Then, triturating its substance between his fingers, he applied his nose to the product and sniffed critically. The outcome was suspicious in the highest degree.
Of means for crushing or triturating quartz there is no lack, and every year gives us fresh inventions for the purpose, each one better than that which preceded it, according to its inventor. Most practical men, however, prefer to continue the use of the stamper battery, which is virtually a pestle and mortar on a large scale.
This was addressed by Toole to his good wife. 'That card? said Jimmey, who happened to be triturating a powder in the corner for little Master Barney Sturk, and who suspended operations, and spoke with the pestle in his fingers, and a very cunning leer on his sharp features: 'I know all about that card. 'You do do you? and why didn't you spake out long ago, you vagabond? said Toole.
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