Theories can lead us to omit or minimize certain observations when making an argument, or they may provide insights leading us to alternative arguments. Darwin did not see glacial features on his first visit to North Wales, UK, but on his second visit when he knew about glaciation he then saw it all around him. Glacial theorists such as Ramsay and Bonney discussed the relationship between glacial erosion and lake formation, arguing by analogy and comparison, but Bonney refused to be swayed by Ramsay’s theories, arguing the need for greater evidence and proof.
AgassizL (1840) Études Sur Les Glaciers. Neuchâtel.
2.
Anon (1901) Eminent living geologists: The Rev. Professor T. G. Bonney. Geological Magazine38: 385–400. Catalogue of scientific papers to 1901. Published online by Cambridge University Press (1 May 2009). doi: 10.1017/S0016756800179270.
3.
Anon (1905) Obituary: William Thomas Blanford, C. I. E., LL. D., F. R. S. The Geographical Journal26: 223–225. Published by Blackwell on behalf of The Royal Geographical Society (with the Institute of British Geographers). Available at: http://www.jstor.org/stable/1776222.
4.
BishopP (1992) Rhetoric, memory and power: Depth psychology and postmodern geography. Environment and Planning D: Society and Space10: 5–22.
5.
BonneyTG (1893) Do glaciers excavate?The Geographical Journal1: 481–499. Published by Blackwell on behalf of The Royal Geographical Society (with the Institute of British Geographers). Available at: http://www.jstor.org/stable/1773962.
6.
BonneyTG (1895) Charles Lyell and Modern Geology. New York: Macmillan.
BurgessGHO (1967) The Curious World of Frank Buckland. London: Baker.
9.
ChorleyRJDunnAJBeckinsaleRP (1964) The History of the Study of Landforms or the Development of Geomorphology. Volume 1. Geomorphology before Davis. London: Methuen.
10.
CondryW (1996) The Snowdonia National Park. New Naturalist Series. London: Collins.
11.
DarwinC (1842) Notes on the effects produced by the ancient glaciers of Caernarvonshire, and on the boulders transported by floating ice. The London, Edinburgh and Dublin Philosophical Magazine21: 180–188.
EvansJ (1800) A Tour of North Wales in the Year 1798, and At Other Times; Principally Undertaken with a View to Botanical Research in that Alpine Country Interspersed with Observations on its Scenery, Agriculture, Manufactures, Customs, History and Antiquities. London: J. White.
14.
FeyerabendP (1999) Conquest of Abundance: A Tale of Abstraction Versus the Richness of Being. Chicago, IL: University of Chicago Press.
15.
GrahamDJMidgleyNG (2000) Moraine-mound formation by englacial thrusting: The Younger Dryas moraines of Cwm Idwal, North Wales. Geological Society of London, Special Publications176: 321–336.
16.
HerbertS (1991) Charles Darwin as a prospective geological author. British Journal for the History of Science24: 159–192.
17.
LakeP (1924) Obituary: The Rev. Prof. Thomas George Bonney, Sc. D., LL. D., F. R. S. The Geographical Journal63: 366–368. Published by Blackwell on behalf of The Royal Geographical Society (with the Institute of British Geographers). Available at: http://www.jstor.org/stable/1781428.
PimmSL (1991) The Balance of Nature? Ecological Issues in the Conservation of Species and Communities. Chicago, IL: University of Chicago Press.
20.
RamsayAC (1862) On the glacial origin of certain lakes in Switzerland, the Black Forest, Great Britain, Sweden, North America and elsewhere. Quarterly Journal of the Geological Society18: 185–205.
21.
SimmonsIG (1993) Interpreting Nature: Cultural Constructions of the Environment. London: Routledge.
22.
TrudgillST (2003) Meaning, knowledge, constructs and fieldwork in physical geography. In: TrudgillSTRoyA (eds) Contemporary Meanings in Physical Geography: From What to Why?London: Arnold, 25–46.
23.
WattsWW (1926) Obituary notices of fellows deceased. T G Bonney. Proceedings of the Royal Society of London Series B99: xvii–xxvii. The Royal Society. Available at: http://www.jstor.org/stable/81104.
24.
WinchesterS (2001) The Map That Changed The World. The Tale of William Smith and the Birth of a Science. London: Viking.
25.
WorsleyP (2007) Charles Darwin’s visit to Cwm Idwal in June 1842. Quaternary Newsletter112: 22–28.
