The Bonanni spring stage fits into the hole in the center of the stage.
The glass sample plate fits into the outer recess. While this plats is not engraved, some plates by Culpeper are engraved "This Glass is to lay ye Fish on to see ye circulation of ye Blood, etc"
The Black/White disc is for opaque samples.
This is a glass depression slide, or "live Box" mounted in a L.v. base. It is for the observation of pond scum or hay infusions.