Recipe: Sponge Cake

Separate the whites and yolks of six eggs. Beat the yolks to a cream, to which add two teacupfuls of powdered sugar, beating again from five to ten minutes, then add two tablespoonfuls of milk or water, a pinch of salt and flavoring. Now add part of the beaten whites; then two cups of flour in which you have sifted two teaspoonfuls of baking powder; mix gradually into the above ingredients, stirring slowly and lightly, only enough to mix them well; lastly add the remainder of the whites of the eggs. Line the tins with buttered paper and fill two-thirds full.

The Whitehouse Cookbook, by Mrs. F.L. Gillette (Year 1887)