i got to thinking about the cake mixes past and I was sure at one time it was add water only. Sure enough women griped that they didn't add enough to make it home made. So dried eggs were removed and the whole eggs were added as ingredients. i think back then also the cake mix had solid shortening (lard ?) also blended in. now it is add eggs and oil with the water.
here is a good timeline of the Betty Crockers cake mix.
http://www.dvo.com/recipe_pages/cakemixes/Over_50_Years_of_Cake_Mix_Success.html
here is a good timeline of the Betty Crockers cake mix.
http://www.dvo.com/recipe_pages/cakemixes/Over_50_Years_of_Cake_Mix_Success.html