  Abundances of lithium, heavy elements and carbon isotope ratios have been
derived in 12 J-type galactic carbon stars. The abundance analysis shows that
in these stars the abundances of s-process elements with respect to the
metallicity are nearly solar. Tc is not present in most of them. The Rb
abundances, obtained from the resonance 7800 {\AA} RbI line, are surprisingly
low, probably due to stroong non-LTE effects. Lithium and $^{13}$C are found to
be enhanced in all the stars. These results are used to discuss the origin of
J-stars.
