To the blasé scientific public of today the electron microscope can still impart the sense of wonder and admiration that no longer attends light microscopy. The latter is so familiar today that we lose sight of its dramatic development. But the 17th century expressed its wonder in many ways.
We can appreciate the earlier attitude only when we understand the way in which the microscope developed. The recent book of Dr. Rooseboom, clearly written and magnificently illustrated, provides just such an understanding. The National Museum for the History of Science, in Leiden, possesses one of the world's great collections of microscopes, a collection which serves as the nucleus around which the book is designed. The exposition is systematic. Dr. Rooseboom traces the development of the various microscope components—the optical parts, the illumination, the arrangement for focusing, the movement of the object in relation to the lens, and the stand. Other