Leeuwenhoek's slices of dried optic nerve compare favourably with his diagrammatic studies.
In several letters, Leeuwenhoek referred to the mites in his home. We can now identify them as Tyrophagus.
On a hand-cut section of pith from the elder (Sambucus nigra) we may discern a white cell and some bacteria.
Careful scanning electron microscopy revealed red cells (erythrocytes) on a section - cut by using an open razor.