Dissolve lemon Jello in 1 cup boiling water. Let cool. Add sour cream, blend well, pour into mold. Dissolve black cherry Jello in 2 cups boiling water. Let cool. Drain (save enough juice to make 1 1/2 cups liquid mixed with water). Add liquid to Jello and blend.
Let cool. Put cherries on top of lemon mixture. Then add liquid over cherries. Refrigerate until set.