I know of no other book that so satisfactorily covers the mysterious world the microscope has revealed to scientists and to laymen. Boys in their early teens are increasingly interested and here is the ideal book. (And a great many adults will find it equally fascinating, as there is nothing condescending in the way it is written.) All phases of the microscopic world are covered, and there are numerous fine photographs throughout. Not a how-to-do book, but a generous sharing of the discoveries of science, the significance and the fascination. The book is done by offset, and is not as successful a job as might be -- a bit on the grey side.