Isaac Newton, The Correspondence of Isaac Newton. Vol. 1. 1661–1675, ed., H. W. Turnbull (Cambridge, UK: Cambridge University Press, 1959), 416.
171
John of Salisbury, The Metalogicon: A Twelfth Century Defense of the Verbal and Logical Arts of the Trivium, trans. Daniel McGarry (Baltimore: Paul Dry Books, 2009), 167.
