Since the employment of achromatic instruments, microscopic research has ceased to be merely an amusement, but has elevated to the dignity of science; yet, so far as the author knows, no book has been issued from the American press which would serve as a guide to those desirous of applying themselves to such studies.<br><br>The present work aims to supply this deficiency. In its preparation the author has aimed less at style than at information. Its matter has been condensed into the smallest possible space, so that it may be, what its title professes, "A Complete Manual on the Use of the Microscope." It does not supersede the necessity of more elaborate works, especially in the departments of Minute Anatomy and Pathology, but gives directions by which such works may be more profitably employed by the student.