“The pathogenic bacteria grown from a diseased organ and injected into animals produce lesions in the same organs of the animals. A streptococcus from a diseased gall bladder produces in the animal injected a cholicystitis. When grown from a tissue surrounding a gastric or duodenal ulcer it produces similar ulcers in the animals injected. A streptococcus in culture if grown on a certain tissue or tissue extract, when injected into animals will attack the tissues similar to those on which it has been cultured. Grown on kidney or kidney extract, it will produce manifest lesions in the kidneys.”