Useful Knowledge: What will it be for the next millennium? In five symposia, members of the Amer. Philosophical Soc. asked this question in April 1999 at the Society's Millennium Meet.

The authors have presented and interpreted Johannes Kepler's Latin text to English readers by putting it into the kind of clear but earnest language they suppose Kepler would have used if he had been writing today.

This volume includes biographies of some of the Society's best known members such as Franklin, David Rittenhouse, John Bartram, Benjamin Rush, John Dickinson, Thomas Hopkinson and many lesser known merchants, artisans, farmers, physicians, ...