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14
A Short History of The World
FOSSILIZED FOOTPRINTS OF A LABYRINTHODONT, CHEIROTHERIUM
(In Natural History Museum, London)
past than the books of a bank are a record of the existence of everybody in the neighbourhood. It is only when a species begins to secrete a shell or a spicule or a carapace or a lime-supported stem, and so put by something for the future, that it goes upon the Record. But in rocks of an age prior to those which bear any fossil traces, graphite, a form of uncombined carbon, is sometimes found, and some authorities consider that it may have been separated out from combination through the vital activities of unknown living things.
