The results of a study of the AGB phase of stellar evolution are presented .
Abundances have been determined for Fe , C , O , the light s-process elements , Y and Zr , the heavy s-process elements , La and Nd , and the r-process element , Eu .
The expected relationship between enhanced C , increasing C/O ratio and enhanced s-process elements has been quantified .
Results are presented to provide observational data with which to compare theoretical predictions .

The results in this paper confirm previously suggested relationships between C , C/O and s-process element enhancements .
It is seen that AGB stars show C/O ratios from C/O \sim 0.4 to 1.0 , while C enhancements lie between [ C/Fe ] =0.1 to 0.9 dex .
Enhancements of s-process elements are as much as [ s/Fe ] \sim 1.0 dex for the stars in which C is also greatly enhanced .