This article argues that the chemical and physiological experiments undertaken by the natural philosopher Stephen Hales (1677-1761) constituted a reformulation of providential matter theory. Hales was responding to a continuing debate about the position of chaos in the natural world between Newtonians like Samuel Clarke, who posited chaos as oppositional to immediate providential direction, and those such as John Ray and Bernard Nieuwentyt, who argued that nature was a chaos of operations, organised by divinely endowed but innate principles. Vegetable Staticks (1727) represents an attempted solution, arguing that a chaos of operations could support life only if it was concurrent with God's direction. Subsequently criticised by the Irish theologian Peter Browne for indulging frivolity, Hales responded in Haemastatics (1733) by auditing how spirituous liquor precipitated a bodily disintegration from the chaos of operations into a destructive chaos. Hales' subsequent campaign against spirits should be read as an extension of his experimental philosophy as a moral tool.Hales had surmised that the leaves "perform in some measure that same office for the support of vegetable life that the lungs of animals do, for the support of animal life." 2 Darwin published a short reply in 1915, maintaining that Hales conflated nutrition and respiration because his view of plant nutrition reflected Isaac Newton's Opticks Query 30, where both respiration and digestion were processes of fermentation. 3 Nonetheless, Gibson maintained that Hales had built on the "foundations of vegetable anatomy" laid down by Nehemiah Grew and used experiment to establish separate and "definite notions as to the part leaves play in plant nutrition. Transpiration is of course their chief function." 4 This disagreement over Hales' accomplishments reflected their divergence over the science that Hales practised. Invoking William Whewell's distinction between "The Why? Of the Physicist [meaning] through what causes?" and "that of the Physiologist -To what end?" Francis Darwin claimed Hales as "chemist and physicist" who was less interested in the exact function of organs than in the underlying fundamental principles of life. In contrast, Gibson heralded Hales as "the founder of experimental physiology of plants" who applied concretely the fundamental principles developed by his predecessor Grew. 5 While historians of science now recognise these labels and divisions as anachronistic in the early modern period, Anna Marie Roos has recently revisited the question of how Hales asked "The Why" and "To what end" and suggests, provokingly, that he was a chymist, part of a tradition that included Robert Boyle and Grew "which attempted to identify the vital principles in the air responsible for respiration with a particular reactive chymical substance." 6 While Roos agrees with Francis Darwin's emphasis on the Newtonian nature of Hales' air, she suggests also the centrality of salt, a "primeval principle or fundamental mover," in Hales' understanding of material ...