Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.
The mezzotint of Isaac Newton on page 1341 of the issue of18 September should have been credited to the Prints Collection,New York Public Library, by permission of New Republic Books.