In the winter of 18077, thirteen like-minded souls in London got together at the Freemasons Tavern at Long Acre, in Covent Garden, to form a dining club to be called the Geological Society. The idea was to meet once a month to swap geological notions over a glass or two of Madeira and a convivial dinner. The price of the meal was set at a deliberately hefty 15 shillings to discourage those whose qualifications were merely cerebral. It soon became apparent, however, that there was a demand for something more properly institutional, with a permanent headquarters, where people could gather to share and discuss new findings. In barely a decade membership grew to 400 - still all gentlemen, of course - and the Geological was threatening to eclipse the Royal as the premier scientific society in the country. The members met twice a month from November until June8, when virtually all of them went off to spend the summer doing fieldwork. These weren't people with a pecuniary interest in minerals, you understand, or even academics for the most part, but simply gentlemen with the wealth and time to indulge a hobby at a more or less professional level. By 1830 there were 745 of them, and the world would never see the like again. It is hard to imagine now, but geology excited the nineteenth century - positively gripped it - in a way that no science ever had before or would again.