From Dumas original Table it is clear, that the common difference between
masses of Ammonium and Méthylium, from the other members from this group (on
the bottom of the Table) is always equal 3.
Facsimile of the frontpage of work of J. B. A. Dumas about mass relations of molecular
fragments, and decomposition of relative atomic masses in smaller fragments
Facsimile of the Table from the work of J. B. A. Dumas about the mass ratios of
molecular fragments, and the analogous decomposition of relative atomic masses in
smaller components
96
10 Systematization, Classification, Structure, and Elements