This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant mark

This groundbreaking scientific journal has been publishing articles on geology, physics, and chemistry for over two centuries. It continues to be an authoritati

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant mark