 With our point of view concerning combinations of logics, it is necessary to investigate the properties of combining deontic and alethic logics: in order to perform such a jump from ‘is’ to ‘ought’ some authors propose (see e.g., Schurz 1997) that what is necessary is an explicit “bridge principle” which specifically connects ‘is’ and ‘ought’. An axiom schema \(X\), following Schurz (1991), is a bridge principle iff \(X\) contains at least one schematic letter which has at least one occurrence within the scope of an \(\obcirc\) (the deontic “obligation” operator) and at least one occurrence outside the scope of any \(\obcirc\). Thus, for instance,   \[p \rightarrow \obcirc p\]   is a bridge principle representing ‘is-ought’ that which would appease Hume’s criticism. On the other hand, the much discussed moral principle ‘ought-implies-can’ (controversially attributed to I. Kant, see Baumgardt 1946) can be formalized through another bridge principle:   \[\obcirc p \rightarrow \lozenge p,\]   where \(\lozenge\) denotes the alethic “possibility” operator.