 Nevertheless, a plausible argument has been made that the actual structure of Darwin’s text is more closely similar to a “Whewellian” rather than to a “Herschelian” model of argument (Ruse 1975, 2013c). In Whewell’s 1840 account, the emphasis of scientific inquiry is, as Herschel had also argued, to be placed on the discovery of “true causes”. But evidence for the determination of a vera causa was to be demonstrated by the ability of disparate phenomena to be drawn together under a single unifying “Conception of the Mind”, exemplified for Whewell by Newton’s universal law of gravitation. This “Consilience of Inductions”, as Whewell termed this process of theoretical unification under a few simple concepts, was achieved only by true scientific theories employing true causes (Whewell 1840: xxxix). In a restatement of this principle in a revised edition of his Philosophy of Inductive Science published only a year before the Origin, Whewell argued that 