abstract: Let V be a complete nonsingular variety defined over Q and let L(s) be the corresponding L-series for codimension d. Bloch and Kato (building on the work of Beilinson) have made conjectures about the value of L(s) when s is an integer. In the case when V is a diagonal hypersurface, such values can be computed explicitly, and it is possible to make a partial comparison between the computed values and the values conjectured by Bloch and Kato. (The comparison is only partial because information about the values conjectured by Bloch and Kato is only partial.)