Location This site displays supracrustal rocks of the Grenville Supergroupas well as some intrusive rocks cutting the Grenville Supergroupwithin the Central Metasedimentary Belt of the Grenville Province (Fig. 1). The trip consists of five stops (l-5) located onor near Ontario 7 between the towns of Havelock and Madoc, Ontario (Fig. 2). One other stop (6) can be easily reached as partof a trip to this site and complements the main stops. Other stopsin the area of Ontario 7 are described by Bartlett and others (1984) and Easton and others (1986). Easton and others (1984) describe stops in the Chandos area 30 mi (50 km) to the northnorthwestin an area of similar geology. The field trip starts in Havelock, at the junction of Ontario 7and 30, about 80 mi (130 km) east-northeast of the City of Toronto and 25 mi (40 km) east of the city of Peterborough; thispoint can be reached from the east or west via Ontario 7. Proceedeast from Havelock on Ontario 7 toward Marmora. Turn northonto Peterborough County Road 48 about 10 mi ( 15 km) east of Havelock. Proceed north on Peterborough County Road 48about 5.6 mi (9 km), turn west onto a private gravel road thatleads to Belmont Lake. Park in the grassy clearing where the roadcurves to the right, and walk back to the track on the left. Followthe track to the cottages overlooking Belmont Lake (about 1,200ft; 350 m, Fig. 4). This is Stop 1 (Stop 4 of Bartlett and others,1984). Please respect

Abstract Five eighteenth-century medical men, like many of their contemporaries, achieved renown for their medical skills and research abilities. They lived during an exciting period marked by the questioning of many traditional beliefs. Coeval scientific achievements increased knowledge of the challenging natural world around them. Outside medicine, John Wall (1708–1776) established the fashionable spa of Malvern, known for the purity of its water, and co-founded the prestigious Worcester Porcelain Company. Erasmus Darwin (1731–1802) had a remarkably inventive mind ranging over many interests, including canal construction, steering equipment for carriages and a copying machine for documents. Edward Jenner (1749–1823) was interested in bird migration, and researched the brood parasitism of the cuckoo. His vaccination of cowpox to prevent smallpox eventually led to the elimination of the disease in 1980. Caleb Parry (1755–1822) practised medicine in Bath and was admired for his knowledge and integrity. He was interested in sheep and produced high-quality merino wool. Since boyhood he had hunted for fossils with his friend, Edward Jenner. John MacCulloch (1773–1835) produced the first geological map of Scotland, published posthumously in 1836. A prolific writer, his book on the Western Isles (1819) is considered a classic.