Melt chocolate in boiling water. Cool. Cream butter and sugar until fluffy.
Add egg yolks, 1 at a time and beat well after each. Add melted chocolate
and vanilla. Mix well. Sift together salt, soda and flour. Add alternately
with buttermilk to chocolate mixture, beating well. Beat until smooth. Fold
in beaten egg whites. Pour into 3 -8 or 9 inch cake pans, well greased and
with bottoms lined with wax paper. Bake in 350 degree oven 30 to 40 min-
utes. Cool. Frost tops only.