This section is from the book "Foods And Household Management", by Helen Kinne. Also available from Amazon: Foods and Household Management.
Mustard
Powdered sugar
A few grains of cayenne
Lemon juice
Vinegar
1 teaspoonful 1 teaspoonful
1 teaspoonful
Yolks of 2
2 tablespoonfuls 2 tablespoonfuls 1 1/2 cups
Stir together the eggs, mustard, salt, pepper, and sugar. Add the oil, a drop at a time, stirring and beating constantly. The back of a silver fork is a good thing for mixing mayonnaise, though some people prefer a Dover beater. As the dressing becomes very thick it should be thinned occasionally with vinegar and lemon, alternately, but never let it lose its consistency. After the first, the oil may be added more rapidly. All ingredients and utensils must be cold. If the weather is warm, the bowl should be surrounded with ice water. If the dressing should separate, begin with another yolk of egg and stir the separated mixture into it slowly, as before. Set the bowl in a cold place and it should keep for many days.
 
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