This section is from the book "Soyer's Standard Cookery", by Nicolas Soyer. Also available from Amazon: Soyer's Standard Cookery.
Mix, until perfectly combined, four ounces of butter and three ounces of sifted flour. This butter is made immediately before the time of dishing up, and is used for quick liaisons like Matelotes, etc.
The sauce to which manied butter has been added should not boil if this can be avoided, as it thereby acquires a very disagreeable taste of raw flour.
 
Continue to: