 John of la Rochelle, a Franciscan theologian, referred to this scheme as a commonly known model in his Summa de anima (1235 [1995: 262]). It was presented as a table with brackets in the sixteenth-century handbook of Jacob Wecker, Medicinae utriusque syntaxes [1576, I.3, p. 181]. For a fourteenth-century formulation, see Maino de Maineri, Regimen sanitatis 3.8, Paris 1506, f. 38v. (Cf. Gil-Sotres 1994.) 