... the sediments from the igneous rocks there is a loss by solution of about 33 per cent; i.e. 100 tons of igneous rock yields rather less than 70 tons of sedimentary rock. This involves a concentration in the sediments of the more insoluble constituents. To this rule the lime-content appears to be an exception. It is not so in reality. Its high value in the sediments is due to its restoration from the ocean to the land. The magnesia and potash are, also, largely restored ... — The Birth-Time of the World and Other Scientific Essays • J. (John) Joly