Biggar et al. (1831) Pamphlets - homoeopathic[books.google.co.za/books?id=nur2LW1DK0cC&q="toxin"] (Scientific), page 40: “…it was conclusively demonstrated that the normal cord and brain form an inert compound with the toxin of tetanus…”
Hans F. Linskens, John F. Jackson (1992) Plant toxin analysis[1] (Scientific), →ISBN, page 28 of 389: “…a host-specific toxin isolated from Helminthosporium sacchari…”
Alistair J. Lax (2005) Toxin: the cunning of bacterial poisons[2] (Scientific), →ISBN: “It appeared likely that a much more deadly type of poison had been used—a biological poison or toxin.”