Le microscope manuel a l'usage des étudiants
A French edition of Heinrich Frey's handbook of microscopy, published in Paris in 1867 for medical and science students learning instrument use. Wood engravings show microscope stands, condensers, stage clamps and lamps in cutaway and elevation, keyed with italic letters, alongside line diagrams tracing light rays through lens and mirror — useful for labelled apparatus and optical schematics.
