This section is from the book "A Textbook Of Domestic Science", by Matilda G. Campbell. Also available from Amazon: A textbook of domestic science for high schools.
Lettuce should be carefully washed to remove any dirt and bacteria which may cling to it and also small green insects which are sometimes found on the under side of the leaves. Wash each leaf separately, changing the water often. Shake the leaf gently to remove water, then place on a clean towel and dry carefully with another towel until perfectly dry, but not wilted.
Place in a bowl of ice water to which has been added 1 tb. vinegar and let stand 1/2 hour.
After washing, put lettuce in a pail, stem end down, cover closely and set in a cold place.
 
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