Abstract
In 1671, Jacques Rohault published his Traité de physique, a textbook on physics relying on his weekly conferences held in Paris. A good mathematician and at the same time a curious experimenter, Rohault was one of the main Cartesian figures of his time. Connected to Parisian philosophical circles, Rohault was deeply concerned with the reception of Descartes’ philosophical views. He was associated with Claude Clerselier and he encouraged Pierre-Sylvain Régis to spread Cartesianism in Toulouse. Performing experiments and using instruments in his observations, allowed for a very good reception of Rohault’s natural philosophy in the late seventeenth century. Thus, his textbook on physics was quickly translated and disseminated across Europe. Of a particular interest is the English version of this book, which was annotated by the celebrated Newtonian, Samuel Clarke. This chapter will provide a deep analysis of Rohault’s system of physics, with an emphasis on his experimental approach. Equally important, the Newtonian reception of Rohault’s treatise will be discussed in close connection to the structure of his philosophical system and the methodological novelties introduced by the French philosopher.
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Notes
- 1.
For a good discussion of Rohault’s life, see Clair 1978. This is the still the best biography available and it sheds a good light on Rohault’s social status and on his personal connection with Clerselier. On Clerselier and Rohault as promoters of Cartesianism in France, see Balz 1930. For the general placement of Rohault within the Cartesian movement, see Bouillier 1868 and Mouy 1934; and for a discussion of Rohault as an experimental philosopher, see McClaughlin 1996, 2000.
- 2.
Rohault’s birth was debated in the literature. For instance, Gérard Milhaud ascribed it to May 23, 1623 (see Milhaud 1972); a famous portrait of him has 1620 inscribed as his year of birth; but more convincing is the view expressed by McClaughlin (see McClaughlin 1976), which ascribes it to 1617. In this chapter, I shall follow the chronology suggested by Clair (see Clair 1978).
- 3.
Mouy 1934, 108: “S’efforçait de constituer, sur les bases cartésiennes, une physique expérimentale. A ses ‘mercredis’, tout Paris, la province, l’étranger même se pressaient pour assister aux belles expériences par lesquelles il confirmait la physique de Descartes.” For an alternative reading of Rohault’s role in the Parisian academies, see Chap. 3 by Roux.
- 4.
See Nouvelles de la République des Lettres Octobre 1685, 1014: “Ce qui fait souvent que l’on ne rencontre pas le nom d’un Auteur, c’est qu’on ne le prononce pas comme on l’écrit. De là est venu que si peut de gens ont bien cité M. Rohault, avant qu’il eût publié lui-même son nom. Les uns le citoient M. Roo, & les autres M. Roho. Qui sçait si un jour l’on ne fera pas de tout cela 2 ou 3 Auteurs differens come l’on a fait à l’égard de plusieurs anciens à cause de l’oubli ou de la transposition d’une seule lettre?”
- 5.
See Journal des sçavans April 26, 1666, 208. Another variation of spelling his name is to be found in Denis, Jean Baptiste. 1668. Lettre ècrite à M. Sorbière…, Paris, where he is called “Roh.”
- 6.
See Matton’s “Remarques sur le manuscrit de la Physique nouvelle” in Rohault 2009.
- 7.
Rohault 2009, LXXXV.
- 8.
This is further supported by the content of the Ms. 2225 of the Bibliothèque Sainte-Geneviève, which collects reports from Rohault’s Wednesday conferences from November 1660 to April 1661 and a discourse from 1669. There seem to be no differences between the Ms. 2225 and the Physique nouvelle with respect to Rohault’s famous experimental cases—his experiments with magnets, his demonstrations of the effects caused by the glass drops, etc. See Rohault 1660.
- 9.
Birch 1756, I, 28.
- 10.
Oldenburg addresses two letters to Saporta where he discusses about Rohault’s public conferences. Thus, on June 28, 1659, Oldenburg gives a high praise to Rohault’s account of vision and on August 11, 1659, he refers to the Frenchman’s explanation of colours. For Oldenburg’s reports, see Oldenburg 1965–1986, I.
- 11.
See Claude Clerselier’s unpaginated preface in Descartes 1659: “d’un tres-grand nombre de personnes…a fait aller à l’assemblée qui se tient tous les Mercredis chez Mr. Rohault, tres-sçavant Mathematicien, & fort experimenté dans les Mechaniques.”
- 12.
For the connection between Rohault, Cyrano, and Moliére, see McClaughlin 1976, 179.
- 13.
Another important biographical detail about Rohault is the name of his first wife, Nicole Fillassier, to whom he married in 1650. After her death in 1663, Rohault remarried in 1664 with Geneviève Clerselier and became, thus, the son-in-law of Claude Clerselier. See McClaughlin 1976, 181 and Clair 1978, 27–28. Fillassier was a family of merchants and craftsmen, which would have facilitated Rohault’s better access to different artisans and workshops. This can explain both Rohault’s familiarity with handling instruments, but also his possibility to get less common materials for his experiments (e.g., glass-drops). I would like to thank Trevor McClaughlin for pressing this point.
- 14.
- 15.
Pierre Clair makes a list of the various editions of Rohault’s book. See Clair 1978, 5–8.
- 16.
See Nouvelles de la République des Lettres October 1706, 455–460.
- 17.
On Le Grand’s Cartesianism, see Chap. 11 by Hatfield.
- 18.
See Nouvelles de la République des Lettres October 1706, 457: “il faut convenir avec Mr. Clarke, que ce premier Traducteur a commis des fautes assez grossiéres.…” The book review is concerned with the Latin edition printed in 1702, which is the second edition prepared by Samuel Clarke. The first edition was printed in 1697.
- 19.
- 20.
See Hoskin 1961.
- 21.
Sarton 1948, 145.
- 22.
- 23.
- 24.
- 25.
For more on this, see the rules drawn by Samuel Sorbière in his letter to Thomas Hobbes from February 1, 1658, in Sorbière 1660, 663–664.
- 26.
See Oldenburg 1965–1986, II, 73.
- 27.
For a list of the instruments and devices found in Rohault’s possession at his death in 1672, see McClaughlin and Picolet 1976.
- 28.
Descartes 1659, unpaginated preface: “les Spectateurs des experiences que l’on y fait, se render aussi les Juges & les Arbitres des explications qu’on leur donne.”
- 29.
Rohault 1682, unpaginated preface: “Ces sortes de preuves si claires, si convaincantes, & si sensibles, fort differentes de ces vertus & qualitez occultes dont les autres Philosophes ont coûtume de se servir pour rendre raison de ce qu’ils ignorent, justifient ce me semble bien clairement la verité des principes dont elles dépendent; car moyen de pouvoir tirer un si grand nombre de consequences justes, & que les effets verifient, d’un si petit nombre de Principes, si ces Principes n’estoient veritables.”
- 30.
See Chap. 1 by Dobre and Nyden.
- 31.
For some examples of Cartesian philosophers who put emphasis on experiment and observation, see Ariew 2006 and other chapters in this volume.
- 32.
Blay, introduction to Rohault 2009, xxix: “Une sorte de conception mécanisto-expérimentale se substitue à la physique métaphysique de Descartes et participe ainsi à la construction d’une nouvelle manière de faire de la science échappant progressivement à la question du sens.”
- 33.
The unofficial version was the Physique nouvelle, as we have seen above.
- 34.
Rohault 1987, unpaginated preface.
- 35.
Rohault 1987, unpaginated preface.
- 36.
Rohault 1987, unpaginated preface.
- 37.
See Mouy 1934, 114–115: “Ce n’est pas contre Descartes que Rohault se prononce ici, évidement. C’est plutôt contre Cordemoy, inventeur d’un atomisme fondé sur des principes métaphysiques soi-disant cartésiens, et aussi contre les scolastiques qui s’embarrassent de définir l’idée métaphysique du mouvement au lieu d’en étudier les lois et les effets” (It is, of course, not against Descartes that Rohault speaks about here. It is more against Cordemoy, supporter of an atomism founded upon so-called Cartesian metaphysical principles and also against the Scholastics…) For Cordemoy’s natural philosophy, see Ablondi 2005.
- 38.
For Boyle’s so-called nescience regarding the divisibility of matter, see Boyle 1999, I, 355–356. For a general discussion of this problem in Boyle, see Anstey 2000, 41–45.
- 39.
Descartes 1667, 543: “que chaque corps peut estre divisé en des parties extremement petites; Je ne veux pas determiner si leur nombre est infiny, ou non, mais à tout le moins il est certain qu’au regard de nostre connoissance il est indefiny.” This third volume of correspondence contains several letters in defence of Cartesian views, written by Clerselier and Rohault.
- 40.
See the title for this letter [97] “Lettre de M. Clerselier, (qui fut luë dans l’assemblée de M. de Montmor le treiziéme Juillet 1658, sous le nom de Monsieur Descartes, & comme si c’eust esté luy qui l’eust autrefois écrite à quelqu’un de ses Amis) servant de réponse aux difficultez que Monsieur de Roberval y avoit proposées en son absence, touchant le mouvement dans le plein” in Descartes 1667, 538.
- 41.
Rohault 1987, unpaginated preface.
- 42.
See Rohault 1987, unpaginated preface.
- 43.
Rohault 1987, unpaginated preface. The second type of experiment listed by Rohault is remarkable for several reasons, including his similarity with Baconian methodology of variation within experiment and its reference to the method of the chymists. For a discussion of seventeenth-century chymists’ reaction to Cartesianism, see Chap. 6 by Joly.
- 44.
Rohault 1987, unpaginated preface. This claim encompasses in a nutshell the double meaning of experiment in Rohault: a negative one, where experiment is used to confirm a particular hypothesis, and a positive one, where experiment is employed in the expansion of a theoretical model to new phenomena. For a discussion of the meaning of Cartesian expérience, see Clarke 1989, 209.
- 45.
The mutual benefit of experiment and speculation for each other is a recurring theme in Robert Boyle’s natural philosophy. For example, commenting Boyle’s method from the Designe about Natural History, Peter Anstey and Michael Hunter argue: “Boyle envisages a reciprocal relation between histories and hypotheses, the one informing the other and vice versa.…Boyle’s methodology is better described as a two-stage reciprocal enterprise in which theory informs experiment with a view to constructing a natural history, which in turn informs theory” (see Anstey and Hunter 2008, 107).
- 46.
Rohault 1987, unpaginated preface. On the same page, his words looks even more confusing, “for scarce can a Philosopher present the Publick with any Fruits of his Studies, but some unknown Person who has a Mind to signalize himself, attacks them before he understands them.”
- 47.
Rohault 1987, I, 1.
- 48.
Rohault 1987, I, 3.
- 49.
Descartes’ move from metaphysics to physics is achieved through his theory of matter. The existence of bodies and the identification between body, matter, and extension are mainly done on the basis of his prior metaphysics. However, there is a gap in the passage from one res extensa to a multitude of res extensae, which Descartes’ philosophy fails to accommodate. For a detailed discussion of the individuation problems in Descartes, see Dobre 2011. For an overview of problems caused by Descartes’ general physics in the Principia philosophiae, see de Buzon and Carraud 1994.
- 50.
- 51.
- 52.
For the corresponding section in the Physique nouvelle, see Rohault 2009, 6: “les facultés de comprendre, ou apprehender, de iuger, de raisonner ou conclure, et enfin de sentir.”
- 53.
See Rohault’s title for Chap. III of the first part of his book: “The Manner of Applying Philosophy to Particular Subjects.” Rohault 1987, I, 13.
- 54.
Rohault 1987, I, 13.
- 55.
Rohault 1987, I, 13–14.
- 56.
- 57.
AT IXb 328, CSM I 290.
- 58.
Rohault 1987, I, 14.
- 59.
- 60.
Rohault 1987, I, 14.
- 61.
See Rohault 1987, I, Part 1, Chap. IV, 15–18.
- 62.
See for example, Galileo’s Assayer (1623), where the difference is between qualities pertaining to senses (i.e., touch), which are supposed to be in the object and qualities that are in the mind of the observer (e.g., colours). Another important place to find this distinction is Boyle’s Origin of Forms and Qualities (1666). For the current chapter, it is not important to discuss the shift of nuances and the evolution of this distinction in the context of seventeenth-century thought, suffice is to say that Rohault draws a similar distinction. For a survey of the problem in the historical context, see Nolan 2011.
- 63.
Rohault will use the same Cartesian view regarding “modes” in his so-called Aristotelian acceptation of the three principles of material things, both in the Traité and the Entretiens. For a discussion of this use in both writings, see Dobre 2010.
- 64.
See Rohault 1987, I, Part 1, Chap. V.
- 65.
Rohault 1987, I, 20.
- 66.
See Rohault 1987, I, 18–20. For his claim that “there are yet more Axioms which I shall afterwards draw many Conclusions from; but because they are not so general as these, I shall content my self with mentioning them, when I have occasion to make use of them,” see p. 20.
- 67.
Rohault 1987, I, 23.
- 68.
Rohault 1987, I, 24.
- 69.
See Clarke’s footnote in Rohault 1987, I, 24.
- 70.
AT IXb 73, CSM I 231.
- 71.
Rohault 1987, I, 28.
- 72.
For the Newtonian reaction against Rohault’s explanation, see Rohault 1987, I, 27. But just before listing several (Newtonian) reasons for rejecting it, Clarke agrees: “This is consistently enough said by him, who affirms the Essence of Matter to be Extension.”
- 73.
Rohault 1987, I, 28.
- 74.
See Chap. 1 by Dobre and Nyden.
- 75.
For Rohault’s connection to craftsmen and artisans, see McClaughlin 1996, 475–476.
- 76.
See letters no. 823 (December 18, 1660), 924 (December 7, 1661), and especially 952 (January 4, 1662) in Huygens 1890–1891, III–IV. Note that in some of these letters, Rohault’s name is spelled “Rohaut.”
- 77.
- 78.
- 79.
For a comparison between the barometric experiments performed by Pascal, Roberval, and Rohault, see Mouy 1934, 126–132. The aim of the current chapter is not to make a similar comparison, but rather to focus on a different aspect of Rohault’s natural philosophy.
- 80.
Rohault 1987, I, 57.
- 81.
Rohault 1987, I, 57.
- 82.
Rohault 1987, I, 57n1.
- 83.
Rohault 1987, I, 58.
- 84.
Rohault 1987, I, 58.
- 85.
See Rohault 1987, I, 58–61.
- 86.
Rohault 1987, I, 61.
- 87.
Rohault 1987, I, 61.
- 88.
See for example Rohault’s explanation of the production of glass-drops in Rohault 1987, I, 136–140; for the explanation in Physique nouvelle, see Rohault 2009, 80–84. The same strategy is applied in his discussion of magnetism; see Rohault 1987, II, 163–187 or Rohault 2009, 370–390. For the glass-drop experiment, see Dobre 2013b, 117–120.
- 89.
Rohault 1987, I, unpaginated preface.
- 90.
Journal des sçavans June 22, 1671, 26: “tout ce Livre n’est qu’une suite d’experiences raisonnées & arranges methodiquement.”
- 91.
- 92.
Vanpaemel 1984, 33.
- 93.
Vanpaemel 1984, 39.
- 94.
On the similarity between Rohault and Boyle with respect to causation, see Kenneth Clatterbaugh’s excellent chapter on “The Limits of Classical Mechanism: Boyle, Rohault, and Newton” in Clatterbaugh 1999.
- 95.
See Laudan 1966.
- 96.
See Roux 1998.
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Acknowledgments
This work was supported by the strategic grant POSDRU/89/1.5/S/62259 (University of Bucharest). I would like to thank Peter Anstey, Trevor McClaughlin, and Tammy Nyden for their comments on the previous draft of this chapter.
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Dobre, M. (2013). Rohault’s Cartesian Physics. In: Dobre, M., Nyden, T. (eds) Cartesian Empiricisms. Studies in History and Philosophy of Science, vol 31. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7690-6_9
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