Franz Huber (Toronto) gives a talk at the MCMP Colloquium (7 May, 2014) titled "On the Justification of Deduction and Induction". Abstract: In this talk I will first present my preferred variant of Hume (1739; 1748)'s argument for the thesis that we cannot justify the principle of induction. Then I will criticize the responses the resulting problem of induction has received by Carnap (1963; 1968) and by Goodman (1954), as well as briefly praise Reichenbach (1938; 1940)'s approach. Some of these authors compare induction to deduction. Haack (1976) compares deduction to induction. I will critically discuss her argument for the thesis that it is impossible to justify the principles of deduction next. In concluding I will defend the thesis that we can justify induction by deduction, and deduction by induction. Along the way I will show how we can understand deduction and induction as normative theories, and I will argue that there are only hypothetical, but no categorical imperatives.