1. Lovejoy, op. cit. (ref. 1), chs ix–xi, esp. 244, 293–4, and 317–26. Cf. Collingwood R. G., The idea of nature (Oxford, 1965 (first pub. 1945)), 121–32.
2. On plenitude and cosmology, cf. Koyré Alexandre, From the closed world to the infinite universe (Baltimore, 1957); its relation to questions of biological extinction is passingly considered in Allen Don Cameron, The legend of Noah (Urbana, Illinois, 1963 (first published 1949)); Rudwick M. J. S., The meaning of fossils (London, 1972), 64–65, 86, and chapter iii, contains a more specific discussion.