The Synthesis and Species 225Dowling, Thomas E., and Carol L. Secor. 1997. The role of hybridization and introgression in
the diversification of animals. Annual Review of Ecology and Systematics 28:593 – 619.
Fisher, Ronald Aylmer. 1930. The Genetical Theory of Natural Selection. Oxford, UK:
Clarendon Press.
Ghiselin, Michael T. 1974. The Economy of Nature and the Evolution of Sex. Berkeley:
University of California Press.
Goldschmidt, Richard B. 1940. The Material Basis of Evolution. Seattle: University of
Washington Press.
Grant, Verne. 1975. Genetics of Flowering Plants. New York: Columbia University Press.
Hájek, Alan. 2003. Interpretations of probability. In Secondary Interpretations of Probability,
ed Edward N. Zalta. Type of Medium. Available at http://plato.stanford.edu/archives
/ um2003/entries/probability-interpret (accessed 5/30/17).
Hull, David L. 1965a. The effect of essentialism on taxonomy—Two thousand years of stasis.
British Journal for the Philosophy of Science 15 (60):314–326.
—. 1976. Are species really individuals? Systematic Zoology 25 (2):174 –191.
—. 1988. Science as a Process: An Evolutionary Account of the Social and Conceptual
Development of Science. Chicago, IL: University of Chicago Press.
Hull, David Lee. 1965b. The effect of essentialism on taxonomy—Two thousand years of
stasis (II). The British Journal for the Philosophy of Science XVI (61):1–18.
Huxley, Julian, ed. 1940. The New Systematics. London: Oxford University Press.
—. 1942. Evolution: The Modern Synthesis. London: Allen and Unwin.
Kitcher, Philip. 1989. Some puzzles about species. In What the Philosophy of Biology is:
Essays Dedicated to David Hull, edited by M. Ruse, 183–208. Dordrecht: Kluwer.
Krüger, Lorenz et al. 1990. The Probabilistic Revolution. 2 vols. Cambridge, MA: MIT Press.
Kvist, L. et al. 2003. Evolution and genetic structure of the great tit (Parus major) com-
plex. Proceedings of the Royal Society of London—Series B: Biological Sciences 270
(1523):14 47–1454.
Liebers, Dorit et al. 2004. The herring gull complex is not a ring species. Proceedings of the
Royal Society of London—Series B: Biological Sciences 271 (1542):893 –901.
Martin, Cristopher H. et al. 2015. Complex histories of repeated gene flow in Cameroon
crater lake cichlids cast doubt on one of the clearest examples of sympatric speciation.
Evolution 69 (6):140 6 –1422.
Mayr, Ernst. 1940. Speciation phenomena in birds. American Naturalist 74 (752):249 –278.
—. 1942. Systematics and the Origin of Species from the Viewpoint of a Zoologist. New York:
Columbia University Press.
—. 1946. The naturalist in Leidy’s time and today. Proceedings of the Academy of Natural
Sciences of Philadelphia 98:271–276.
—. 1955. Karl Jordan’s contribution to current concepts in systematics and evolution. In
Evolution and the Diversity of Life, edited by Ernst Mayr, 297–306. Cambridge, MA:
Harvard University Press.
—. 1957. Species concepts and definitions. In The Species Problem: A Symposium Presented
at the Atlanta Meeting of the American Association for the Advancement of Science,
December 28–29, 1955, Publication No 50, edited by Ernst Mayr, 1–22. Washington,
DC: American Association for the Advancement of Science.
—. 1959. Darwin and the evolutionary theory in biology. In Evolution and Anthropology: A
Centennial Appraisal, edited by B. J. Meggers, 1–10. Washington, DC: Anthropological
Society of Washington.
—. 1963. Animal Species and Evolution. Cambridge, MA: The Belknap Press of Harvard
University Press.
—. 1970. Populations, Species, and Evolution: An Abridgment of Animal Species and
Evolution. Cambridge, MA: The Belknap Press of Harvard University Press.
—. 1976. Is the species a class or an individual? Systematic Zoology 25 (2):192.