Henry De la Beche (1796 1855) was a geologist who published widely on various aspects of this science and was elected to the Royal Society in 1823. He was involved with the Ordnance Survey maps of Britain, and became president of the Geological Society in 1847. De la Beche was also instrumental in the 1851 opening of two influential institutions: the Museum of Practical Geology and the School of Mines and of Science Applied to the Arts, which were housed on the same site in London. His Geological Manual, first published in 1831, also had French, German and US editions. In this expanded third...

John Playfair (1748 1819) was a Scottish mathematician and geologist best known for his defence of James Hutton's geological theories. He attended the University of St Andrews, completing his theological studies in 1770. In 1785 he was appointed joint Professor of Mathematics at the University of Edinburgh, and in 1805 he was elected Professor of Natural Philosophy. This highly influential book, first published in 1802, contains Playfair's clarification and summary of Hutton's geological concepts. Playfair concisely explains Hutton's theories on erosion and geothermal heat in rock formation...