Introduction and sections II and IV formulate moving-body electromagnetism relative to a stationary ether and introduce transformations of the equations. The 2021 date in the facsimile repository is the digitization date, not the publication date. The source is used to distinguish nineteenth-century ether dynamics from Albert Einstein's 1905 principle-based treatment.
Sections 1–3 state the aim of a systematic moving-system theory and begin from electron-theory field equations; sections 10–11 discuss assumptions about the deformation of moving matter and their optical consequences. This immediate pre-Einstein comparison is explicitly a twentieth-century work, not a nineteenth-century publication.