IMMUNITY IN MULTICELLULAR PLANTS 29
Infective diseases of plants.—Plasmodia of the Myxomycetes and
their chemiotaxis.—Adaptation of the plasmodia to
poisons.—Pathogenic action of _Sclerotinia_ upon
Phanerogams.—The cicatrisation of plants.—Defence in plants
against Bacteria.—Sensitiveness of vegetable cells to osmotic
pressure.—Adaptation of plants to modifications of osmotic
pressure.—Dependence of the chemical phenomena upon the
irritability of the vegetable cells.—The law of Weber-Fechner.