Alexander Pope (1846). “An Essay on Man: In Four Epistles to H. St. John (Lord Bolingbroke). To which are Added, The Universal Prayer, An Essay on the Knowledge and Character of Men, and Other Pieces, with Notes”, p.61
Robert Hooke (1667). “Micrographia: Or, Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses. With Observations and Inquiries Thereupon”, p.18