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Updated: June 2, 2025
Add to this the presence of a lime-cement in the water, resulting from the decomposition of some of these materials, and we have all that is needed to make a very compact deposit and fertile soil, on which a vegetation may spring up, whenever seeds floating from the shore or dropped by birds in their flight take root on the newly formed island.
This repair substance is called callus. The most remarkable thing about the process is that, when it has held the two broken ends together long enough for them to "knit" firmly that is, to connect their blood vessels and marrow cavities properly this handful of lime-cement, which has piled up around the break, gradually melts away and disappears; so that, if the ends of the bone have been brought accurately together, you can hardly tell where the break was, except by a slight ridge or thickening.
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