 A less discussed regress that can be found in Ryle (1946: 6–7) is an adaptation of Lewis Carroll’s (1895) regress. Suppose a student understands the premises of an argument and also its conclusion but fails to see that the conclusion follows. In order to help him, the teacher teaches him another proposition P—i.e., if the premises are true, then the conclusion is true. The student understands this and yet fails to see how from the premises and the additional premise P the conclusion follows. A second hypothetical proposition is added to his store, the proposition that if the premises is true, the conclusion is true too. The student still fails to see. And so on. Ryle concludes: 