  With the Wigner Function Moments (WFM) method the scissors mode of the
actinides and rare earth nuclei are investigated. The unexplained experimental
fact that in $^{232}$Th a double hump structure is found finds a natural
explanation within WFM. It is predicted that the lower peak corresponds to an
isovector spin scissors mode whereas the higher lying states corresponds to the
conventional isovector orbital scissors mode. The experimental situation is
scrutinized in this respect concerning practically all results of $M1$
excitations.
