  The magnetic susceptibility of the quarter-filled one-dimensional extended
Hubbard model is calculated using the density-matrix renormalization group
technique.
  It is found that in the charge gap regime of the model ($U> 4t $ and $V >
2t$), or in the metallic region with important superconductive fluctuations
($U<4t$ and $V>2t$), $\chi(T)$ displays a singularity at T=0 and an inflection
point at low temperatures that are similar to what occurs in the spin-half
quantum spin chain. These results, whose accuracy outdoes that of any other
available technique, are useful data which allow a comparison between theory
and experiment in the normal phase of the organic conductors.
