Abstract
The physico-mathematics that emerged at the beginning of the seventeenth century entailed the quantitative analysis of the physical nature with optics, meteorology and hydrostatics as its main subjects. Rather than considering physico-mathematics as the mathematization of natural philosophy, it can be characterized it as the physicalization of mathematics, in particular the subordinate mixed mathematics. Such transformation of mixed mathematics was a process in which physico-mathematics became liberated from Aristotelian constraints. This new approach to natural philosophy was strongly influenced by Jesuit writings and experimental practices. In this paper we will look at the strategies in which models were selected from the mixed sciences, engineering and technology adequate for an analysis of the specific phenomena under investigation. We will discuss Descartes’ analysis of the rainbow in the eight discourse of his Meteorology as an example of carefully selected models for physico-mathematical reasoning. We will further demonstrate that these models were readily available from Jesuit education and literature.
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Notes
- 1.
[6], I, 244: “Dicit tamen se nunquam neminem reperisse, praeter me, qui hoc modo, quo ego gaudeo, studendi utatur accuratèque cum Mathematicâ, Physicam jungat. Neque etiam ego, praeter illum, nemini locutus sum hujusmodi studij”.
- 2.
From a letter from Descartes to Vatier, February 1638, [8], I, pp. 559–660: “Nor could I show the use of that method in the three treatises that I included, since it prescribes an order of investigation which is different enough from the order I believed I must use in order to explain them. However, I have given a sample of it in describing the rainbow, and if you take the trouble to reread it, I hope it will satisfy you better that it did the first time”. Translation from [10], p. 86.
- 3.
For a forthcoming critical edition of the English translation of this book see [15].
- 4.
SP, Geometry, prop. XII, p. 8: “Potest unum & idem corpus solidum ac durum, per tria foramina transmitti, quorum unum sit rotundum, secundum quadratum, tertium ovale, ita ut singula in transitu compleat; potest aliud eandem conditione transmitti per rotundum, ovale & quadr angulare quantaelibet longitudinis: aliud, per rotundum & quandrangulare; alius per rotundum & triangulare duntaxat”.
- 5.
SP, Optics, prop. XX, p. 35: “Refractio et reflexio, varia coelestibus ac sublunaribus pingit phasmata, halones, parelia, paraselenias, irides in nubibus, in crystallo trigonam, in ampulis vitreus, in polyoptris, in aquam fontium arcuaram et irroratam, in lucernic ardentibus. Ubi certum videtur, colores hic apparentes, causam habere congenerem, puta per mixtionem refractae lucis cum refrigente subiecto; figures autem diversas, incidentium, refractorum simul et reflexorum radiorum legibus gubernari. Probabile est, geminari posse lunarem iridem, sicut et solarem, sic tamen, ut secundaria iris non sit imago alterius ex reflexione producta”.
- 6.
Compare Descartes, [8], VI, p. 343: “qui pourroient causer grande admiration a ceux qui en ignoreroient les raisons”, with one of several similar formulations in RM: “avec grand estonnement des assistans particulierement s’ils en ignorent la cause” (1630, p. 73).
- 7.
From the English edition: 1633, p. 68: “But to have one more stable and permanent in his colours. Take a glass full of water, and expose it to the sun, so that the rays that pass through strike upon a shadowed place, you will have pleasure to see the fine form of a rainbow by this reflection”.
- 8.
SP, Geometry, XV: “Mathematicae iucunditatis est, in sphaerulis eburneis, aut buxeis, et similibus, ita ludere, ut reflecionem legibus, una in planum, aut duo vel plura plana impingens, ad destinatum locum emittatur: vel ita una sphaerula, caeteras impellens, ad quamcunque volveris partem dirigat, assignatis etiam, si lubet, variorum motuum lineis, variorum contactuum et allisionum punctis, sive in plano, sive per ambitu[m] circuli”.
- 9.
From the English edition which does not mention billiard but tennis and trap-ball. This reference to the game of trap-ball predates the earliest entry in the Oxford English Dictionary (1658). The figure is taken from the author’s copy of the 1672 Lyon edition. Johannes Marcus expands on these rules in a later treatise of 1636 (see Fig. 5). The earliest depiction of tennis is shown in Fig. 6.
- 10.
Philosophical Transactions of the Royal Society, No. 80 (19 Feb. 1671/2), pp. 3075–3087.
- 11.
Philosophical Transactions of the Royal Society, No. 80 (19 Feb. 1671/2), pp. 3075–3087.
- 12.
[6], III, 237: “Iris oculi est humor corneae concavo adhaerens a parte sui pupillae, limbum (ubi lux dissolvens humores, est debilior quam in medio) inficiens, id est tegens. Hinc sequitur iridem circa candelam, aut quodvis lumen pupilla majus, visam, eo videri majorem quo lumen id est ab oculo remotius”.
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Acknowledgments
The author is a research fellow of the Research Foundation Flanders (FWO Vlaanderen) and member of the Centre for History of Science at Ghent University, Belgium. The paper benefited from discussions with Delphine Bellis, Madelina Giurgea and Maarten Van Dyck.
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Heeffer, A. (2014). Identifying Adequate Models in Physico-Mathematics: Descartes’ Analysis of the Rainbow. In: Magnani, L. (eds) Model-Based Reasoning in Science and Technology. Studies in Applied Philosophy, Epistemology and Rational Ethics, vol 8. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37428-9_23
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