  Magnetic susceptibilities of spin-$(S,s)$ ferrimagnetic Heisenberg chains are
numerically investigated. It is argued how the ferromagnetic and
antiferromagnetic features of quantum ferrimagnets are exhibited as functions
of $(S,s)$. Spin-$(S,s)$ ferrimagnetic chains behave like combinations of
spin-$(S-s)$ ferromagnetic and spin-$(2s)$ antiferromagnetic chains provided
$S=2s$.
