In districts where the water is of a " hard nature," that is, contains bicarbonate of lime in solution, the interior of the boiler cylinders, tanks and pipes of a hot water system will become incrusted with a deposit of lime which is gradually precipitated as the water is heated to boiling point.
By the time the third stage, which placed the seat of soul-life in the brain, was reached through the further advance of anatomical knowledge, the religious rites of Greece and Rome were too deeply incrusted to admit of further radical changes, and faith in the gods had already declined too far to bring new elements into the religion.
The dredge often brings up large numbers of nodules formed upon sharks' teeth, the ear-bones of whales or turtles or small fragments of pumice or other volcanic ejecta, and all more or less incrusted with manganese oxide until the nodules vary in size from that of a potato to that of a man's head.
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