“The laws of thought are natural laws with which we have no power to interfere, and which are of course not to be in any way confused with the artificial laws of a country, which are invented by men and can be altered by them. Every science is occupied in detecting and describing the natural laws which are inflexibly observed by the objects treated in the Science.”

Introduction, Lesson I: Definition and Sphere of the Science.
Elementary Lessons on Logic (1870)

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William Stanley Jevons69

English economist and logician 1835–1882

Russell Jacoby (1945) American historian

Source: Social Amnesia: A Critique of Conformist Psychology from Adler to Laing (1975), p. 65

“An essential distinction exists between two stages in the process of advancing our knowledge of the laws of physical phenomena; the first stage consists in observing the relations of phenomena, whether of such as occur in the ordinary course of nature, or of such as are artificially produced in experimental investigations, and in expressing the relations so observed by propositions called formal laws. The second stage consists in reducing the formal laws of an entire class of phenomena to the form of a science; that is to say, in discovering the most simple system of principles, from which all the formal laws of the class of phenomena can be deduced as consequences.”

William John Macquorn Rankine (1820–1872) civil engineer

Source: "Outlines of the Science of Energetics," (1855), p. 121; Lead paragraph: Section "What Constitutes A Physical Theory"

“The natural world has its laws, and no man must interfere with them in the way of presentment any more than in the way of use; but they themselves may suggest laws of other kinds, and man may, if he pleases, invent a little world of his own, with its own laws; for there is that in him which delights in calling up new forms — which is the nearest, perhaps, he can come to creation. When such forms are new embodiments of old truths, we call them products of the Imagination; when they are mere inventions, however lovely, I should call them the work of the Fancy: in either case, Law has been diligently at work.”

George MacDonald (1824–1905) Scottish journalist, novelist

The Fantastic Imagination (1893)

“Painting is a science and should be pursued as an inquiry into the laws of nature. Why, then, may not a landscape be considered as a branch of natural philosophy, of which pictures are but experiments?”

John Constable (1776–1837) English Romantic painter

Quote from 'The History of Landscape Painting,' fourth lecture, Royal Institution (16 June 1836), from John Constable's Discourses, ed. R.B. Beckett, (Ipswich, Suffolk Records Society, 1970), p. 69.
1830s, his lectures History of Landscape Painting (1836)