The Magazine

A Natural Philosopher

Isolation was muse, and handicap, for René Descartes.

Sep 4, 2006, Vol. 11, No. 47 • By EDWIN M. YODER JR.
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A Biography

by Desmond M. Clarke

Cambridge, 520 pp., $40

The inescapable hazard of historical inquiry is that, as we explore time past, we become Whigs in Herbert Butterfield's sense: prisoners of the categories and verdicts in which our own age is steeped, ratifying what time has established. Even in the history of science--especially there--it is easy to slight the brilliant figures, including the subject of this biography, who lived and worked in a pre-Einstein, pre-Darwinian and, more to the point, pre-Newtonian world.

Futurologists, so-called, try to imagine the next age. But their speculations are often ludicrously wrong. What we can do, more reliably, is try to view the problems of 17th-century "natural philosophy" (as science was then still called, for Mr. Eliot's dissociation of sensibility had not yet occurred) as they appeared to Descartes, Galileo, Kepler, and other giants.

Since he has written an earlier book on Cartesian science, Dr. Clarke gets a pass for dwelling here at extreme length on the merely personal. Descartes, who came of the high gentry and enjoyed the independence of inherited wealth, emerges as a cranky, solitary, and often quarrelsome man even with friends. It isn't clear why this brilliant graduate of the Jesuit college at La Flèche soon quit his native France (first as an officer in a Dutch army, then permanently) and passed almost all the rest of his life in obscure towns in the northern Netherlands.

A loner, he often spent his mornings in bed, read few books (he claimed) and collected fewer, especially if they were critical of him. He never married but fathered an illegitimate daughter by a maidservant. Philosophers do not often lead adventurous lives, and Descartes is no exception.

Dr. Clarke never really decides what prompted Descartes's constant shuttling from hamlet to hamlet, though there are insinuations of debt and sexual irregularity. Documentation, aside from letters, is exiguous. One possible explanation is that Descartes was fleeing Jesuit influence, actual or imagined. The Jesuits had educated him in the scholasticism of that age and continued to dominate the intellectual climate of France. So he conducted a lifelong fencing match with the Jesuit fathers, seeking their imprimatur on his writings and pretending to adjust his speculations to the doctrines of Counter Reformation Catholic orthodoxy.

In fact, he kept the company of Protestants--even Calvinists, unavoidable in Holland, though he detested their outlook--and was critical of the thought patterns that had structured Catholic orthodoxy for ages, with its proliferating entities. He especially evaded discussion of such tricky matters as transubstantiation.

Then there was the Inquisition, a real if distant threat. At a time when Galileo was forbidden to teach the heliocentric theory (and even speculations about rainbows could be censored and punished), Descartes addressed all the issues of the infant physics: optics, motion, ballistics, astronomy, even anatomy. Descartes was the father of analytic geometry; that is, the first great thinker of the Western tradition to view mathematics rather than theology as the sovereign key to the cosmic mysteries--and the cosmos itself as something like an autonomous machine.

His is often described as the first "mechanical philosophy." He limned what would be known as Newton's laws of inertia. He realized that some force must account for planetary motion and that such motion involved a mathematical relationship between arcs and their tangents. He believed, as most contemporaries did, that nature abhors a vacuum, so that the movement of heavenly bodies disclosed by the telescope needed some propellant.

What later ages (up to Einstein) would call the "ether" he considered to be an invisible medium of swirling corpuscles, whose whirlpool-like vortices accounted for the motion of planets. Since there could be no void, a priori, hence no motion without a tangible force behind it, he did not conceive of action at a distance. In those uncertainties he had distinguished company. Not even his great successor, Isaac Newton, reached certainty about the nature of the force he subdued to calculus and called universal gravitation. Galileo scoffed at Kepler's suggestion that the moon might influence tides. (He called it a "puerility.")