This section is from the book "Scientific Feeding", by Mrs. Dora C. C. L. Roper. Also available from Amazon: Scientific feeding.
Mix three tablespoonsful of olive oil with one of vinegar, or with the juice of one lemon and one grated onion. To this may be added sugar, pepper, salt, parsley or mustard, if desired. The proportion of oil and vinegar may be changed according to the taste. For fruit salads, lemon should always be used instead of vinegar. For raw vegetables, the dressing should not be poured over the salad until ready to serve.
Put into a high narrow bowl the yolk of an egg and one whole egg, a tablespoonful of flour, one of olive oil, one of vinegar, and a little mustard; beat with an egg beater about five minutes, or until it becomes thick, adding slowly one cup of cottonseed or olive oil while beating it. Flavor with lemon juice, onion and salt, to suit the taste. Keep on ice.
Stir one or several yolks of eggs and mustard with a fork on a soup plate for several minutes. Slowly add some olive oil, and if it becomes too thick, add lemon juice, then salt, sugar and onion, if desired. Keep on ice.
Make dressing number two. Add salt and sugar to suit the taste, and one cup of thick cream. Keep on ice.
Take the yolks of three hard boiled eggs and one raw yolk. Stir as smooth as butter, with one teaspoonful of mustard, one of sugar, one of grated onion, a little salt and pepper, the juice of a lemon or some good vinegar, then add slowly one-half or one cupful of olive oil. If the dressing is too thick add some cold veal jelly until it has the right consistency. Keep on ice.
Grate one medium sized cold boiled potato, stir one or two hard boiled eggs through a strainer and mix with the potato. Add the yolk of one or more eggs, stir well, then slowly add some olive oil, mix with lemon juice or vinegar, and flavor.
Cream one-fourth of a pound of butter, add the yolk of one raw egg, and the finely grated yolks of two hard boiled eggs. Mix well, and add finely chopped parsley, onion, a little mace and some lemon juice. Serve with cold meat or fish, or spread on bread.
Prepare butter and eggs as directed in number six, adding finely chopped boiled ham, sardellen, anchovies or well soaked salt herring. Eat with cold meat, or spread on bread.
Mix two tablespoonsful of flour with five yolks of eggs, then add a half cup of butter or a cup of cream, a little salt and pepper, (sugar if desired), three to four tablespoonsful of vinegar and one to two cups of soup stock. Pour into a double boiler and stir over a hot fire until thick, then remove and stir until cool. Finely chopped parsley, capers, pickles, or olives may be added. If lemon is desired, use half the amount of vinegar while boiling, and add the lemon juice after it has been removed from the fire.
Boil a small veal bone in three or four pints of water, adding salt, several onions, whole pepper and some spiced herbs. Y\"hen nearly done, add three to six tablespoonsful of good vinegar, strain and add the yolks of several eggs. Stir until cool, and place on ice. Serve with cold fish or meat. If the sweet-sour taste is liked, a little sugar may be added to the broth while boiling. Ripe olives are also a good addition.
Add the juice of one lemon, orange, or grapefruit, to one-half cup of maple or table syrup. Mix well and serve with pancakes. This is more nourishing and wholesome than pure sweets. Do not prepare more than enough for one meal at a time.
Let a half cup of syrup and a small tablespoonful of vinegar come to a boil. Add one finely chopped onion. Remove from the fire and cool, adding the desired amount of oil, and mixing well. This is good for lettuce and watercress. Serve with pancakes, meats, fish, or baked rolled oats, or with rye or wheat. If lemons or oranges are used in place of vinegar, do not allow the latter to boil. Prepare fresh for each meal. Do not use vinegar or onions with fancy fruits.
 
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