Date: 1748, 1749

"The body may be consider'd as a clock, and the fresh chyle we may look upon as the former of that clock."

— Julien Offray de La Mettrie (1709-1751)

Date: October 1750, 1752, 1791

"The less the body to the view, / The soul (like springs in closer durance pent) / Is all exertion, ever new, / Unceasing, unextinguish'd, and unspent"

— Smart, Christopher (1722-1771)

Date: 1751, 1777

"We may as well imagine, that minute wheels and springs, like those of a watch, give motion to a loaded wagon, as account for the origin of passion from such abstruse reflections."

— Hume, David (1711-1776)

Date: 1751

"If any Man hath found out a Kind of Motive which doth not affect himself, he hath made a deeper Investigation into the 'Springs, Weights, and Balances' of the human Heart, than I can pretend to."

— Brown, John (1715-1766)

Date: 1751

"The sympathy, therefore, or consent observed between the nerves of various parts of the body, is not to be explained mechanically, but ought to be ascribed to the energy of that sentient being, which seems in a peculiar manner to reside in the brain, and, by means of the nerves, moves, actuates,...

— Whytt, Robert (1714-1766)

Date: 1751

"The bodies of brute animals are actuated by a principle of a like kind with what is placed in man, but greatly inferior with regard to the degrees of reason and intelligence which it possesses: in the more perfect brutes, this principle is plainly intelligent as well as sentient; and their actio...

— Whytt, Robert (1714-1766)

Date: 1752

A puppet may be "compell'd by secret Springs" just as an engine "moves with Motions not its own"

— Duncombe, John (1729-1786) [pseud.]

Date: 1753

"Passion! the spring, that all life's wheels employs, / Winds up the working thought--and heightens joys."

— Hill, Aaron (1685-1750)

Date: 1755

"Lord have mercy upon us! said the squire, did not I tell your worship to consider well what you were about? did not I assure you, they were no other than wind-mills? indeed no body could mistake them for any thing else, but one who has wind-mills in his own head!"

— Cervantes Saavedra, Miguel de (1547-1616); Smollett, Tobias (1721-1771)

Date: 1757-9

"He gapes to catch the Droppings of my Lord; / And tickled to the Soul at every Joke, / Like a press'd Watch repeats what t'other spoke: / Echo to Nonsense! such a Scene to hear!"

— Duncombe, John (1729-1786) [Editor]