 Much of the discussion of these and related questions was stimulated by Buchdahl, who argues (1969a,b) that the principle of causality in the Analytic of the Critique of Pure Reason is insufficient to account for nature’s subordination to particular causal laws and that, in addition, a principle of systematicity is required to account for nature’s empirical lawlikeness. A similar view is developed by Philip Kitcher (1986); for a somewhat revised view, see his 1994. Guyer (1990b) follows McFarland (1970) in ascribing less cognitive significance to the principle of nature’s purposiveness for our cognitive faculties, holding that it is required only to provide us with rational motivation for attempts at systematizing nature; see also Guyer (1990c, 1979 [1997: ch. 2], and 2003c). Other influential discussions from the late 1980s and early 1990s include Horstmann (1989), Brandt (1989), Butts (1990), Friedman (1992b and 1992a: ch. 5), Patricia Kitcher (1990: ch. 8; 1992), Walker (1990), and Brittan (1992). Friedman’s view is notable in taking a top-down approach to the systematicity of nature, on which empirical laws of nature (such as the laws of chemistry) can be justified a priori through a top-down approach illustrated by Kant’s justification of Newton’s law of universal gravitation in the Metaphysical Foundations of Natural Science. Some of the literature from this period, especially the views of Philip Kitcher and Buchdahl, is discussed in Ginsborg 2018a.