A brief early history of the microscope from the first machine to the development of modern lenses leads directly into some sound advice on what to look for when purchasing a microscope and instructions on setting up specimens for viewing and focusing. But how can one identify the object under the lens? This question is carefully answered throughout the book by careful analyses of what one is likely to find in fresh water -- from protoza to algae, on field trips in search of plants, among insects and higher animals, beneath salt waters and in an examination of such inorganic materials as metals and crystals. Experiments scattered throughout each chapter will produce most satisfying results and the absence of cumbersome additional equipment will please everyone. Definitions of basic terminology sectioning, staining, mounting, etc.,- complete this invitation to penetrate beyond what meets the eye. Miss Cosgrove's writing is academic rather than conversational.