  We present new HI (20" resolution) and CO observations of NGC 4548, an anemic
galaxy in the Virgo cluster. The atomic gas distribution shows a ring structure
which is distorted at the northern edge. The overall rotation curve is derived
with a tilted ring model. We compare our rotation curve with previous ones and
discuss the differences. The velocity field of the CO pointings fit very well
with the one of the atomic gas where they overlap. The CO emission permits to
extend the rotation curve towards the galaxy centre. The molecular fraction is
derived for the inner 120" x 120" centered on the galaxy. We compare the HI and
CO emission to H_alpha line and optical blue emission maps. The bar in the
centre favors star formation at the outer end of the bar. The HI intensity
distribution and velocity field of the northern perturbation are deprojected
with the help of a first order kinematical model. They are discussed in the
framework of warps. It is concluded that the scenario of ram pressure stripping
responsible for the gas removal and the northern perturbation is a very
probable one. In this case the ram pressure which may have caused the galaxy's
HI deficiency is now fading after the galaxy's close passage to the cluster
centre or increasing again due to a second approach of the galaxy to the
cluster centre.
