1902 P.Jousset investigated the effects of silver nitrate up to 25c on mycelium. He found significant results in their weights, finding that the silver nitrate stunted growth. (reported by Gabriel Bertrand) “The Extraordinary Sensitiveness of Aspergillus Niger to Manganese.” Comptes Rendus Academie des Science; 154, 616, 1912
1906 Boericke and Tafel made an unusual observation of the emanations from a high dilute of radium bromide (30c), to photograph a picture of the outline of a key. (Tafel’s Jottings, 1906.)
1928 JUNKER, Hermann The Effect of Extreme DIlutions on Microorganisms Phluger’s Archiv fur die Gesamte Physiologie, 219, pp 647-672, 1928
1923 Lilli Kolisko, Physical and Physiological Demonastration of the Effect of the Smallest Entities. Der Kommende Tag, A-G Verlag, Stuttgart, 1923 pp. 1-10