. . . . . . . . . "Address delivered at the anniversary meeting of the Geological Society of London, on the 15th of February, 1850 : prefaced by the announcement of the award of the Wollaston Palladium-Medal for the same year"@en . "Address delivered at the anniversary meeting of the Geological Society of London, on the 15th of February, 1850 : prefaced by the announcement of the award of the Wollaston Palladium-Medal for the same year" . . . . .