In 1843, Leopold Gmelin worked with the Dobereiner’s system and developed a table of 55 elements that contained many of the similar relationships later found in the modern periodic table. Then in 1857 ...

Dobereiner's 'triads' passed unnoticed at the time, and only after Newlands' 'law of octaves' and Mendeleef's Periodic Law had been enunciated some fifty years later did Dobereiner's work attract ...