This section is from the book "The Cook's Guide", by Semper Fidelis Circle. Also available from Amazon: The Cook's Guide.
Put 1 tablespoon butter into sauce pan; when melted add 1 tablespoon flour and rub to a smooth paste; add 1 1/2 cups milk; stir constantly and cook until it is of the consistency of thick cream; add salt and pepper. The butter must not brown, and the sauce should be perfectly smooth and free from lumps.
Proceed as above, using more butter and boiling water in place of milk, pouring it on gradually and stirring briskly to prevent lumping. Allow the sauce to boil up once after it is smooth.
 
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