Chemical Investigations on the Active Principles of the Phenomenon of Local Skin Reactivity to Bacterial Filtrates

B. coli, meningococcus, and B. typhosus have been cultivated in a diffused broth medium, prepared by immersing cellophane bags containing saline into nutrient broth. An abundant growth occurred inside the bags, while the outside broth remained sterile. Under these conditions, the production of the active principles of the phenomenon of local skin reactivity to bacterial filtrates has been consistent. When the culture filtrates so obtained were redialyzed against saline, active preparations were obtained which were practically free from non-specific ingredients.