This article expands a traditional pedagogic interpretation of Plato’s reasons for urging trainee rulers to study astronomy. It argues, primarily, that they need to become familiar with astronomy because it teaches them about cosmic harmony. This harmony indeed models a “personal harmony,” which will prevent them from becoming tyrants, and informs them about the analogous social harmony— which it will be their special duty to create and maintain. In Plato’s view, indeed, astronomy shows that social harmony requires obedience on the (...) part of the lower orders and that social goods are best distributed in accordance with a special antidemocratic principle of equality. (shrink)

This essay explores the use of stringed instruments (and in particular the harpsichord) as models of brain and cognitive function in eighteenth-century French medicine and natural philosophy. These comparisons were founded in part on the anatomical investigations of the latter half of the seventeenth century, which had established both the “fibrous” structure of the white and gray matter of the cerebrum and the vibratory movement the brain underwent in the performance of its functions. Musical instruments—and in particular the harpsichord—helped these (...) philosophers speculate about how the brain worked as the material instrument of sensation and thought: they were machines at once mechanical and affective, grounded in the materiality of their wooden boards and metal strings, yet symbolizing the rational—and immaterial—harmonies of music. (shrink)