Botulinum toxin
In 1895 (seventy-five years later), Émile van Ermengem, professor of bacteriology and a student of Robert Koch, correctly described "Clostridium botulinum" as the bacterial source of the toxin. Thirty-four attendees at a funeral were poisoned by eating partially salted ham, an extract of which was found to cause botulism-like paralysis in laboratory animals. Van Ermengem isolated and grew the bacterium, and described its toxin, which was later purified by P Tessmer Snipe and Hermann Sommer.
Treat Baldwin Johnson
Johnson was the editor of the owner's manual for A. C. Gilbert Company's chemistry sets. He, together with R.D. Coghill, was the first to discover the existence of 5-Methylcytosine in nature, from tuberculinic acid, a nucleotide of Mycobacterium tuberculosis.