 Non-transmissive arguments are not necessarily premise-circular arguments. A different source of non-transmissivity instantiating a subtler form of circularity is the dependence of evidential relations on background or collateral information. This type of dependence is a rather familiar phenomenon: the boiling of a kettle on a camping stove gives one justification for believing that the temperature of the liquid inside is approximately 100 °C only if one knows that the liquid is water and that atmospheric pressure is the one of the sea-level. It doesn’t if one knows that the kettle is on the top of a high mountain, or if one knows that the kettle contains, say, sulphuric acid. 