This section is from the book "Fruits And Their Cookery", by Harriet S. Nelson. Also available from Amazon: Fruits and Their Cookery.
Boil two cupfuls of sugar and four cupfuls of water until a rich syrup is formed. Add one cupful lemon juice. Dilute with ice water.
Pick over and soak four tablespoonfuls of Irish moss in cold water to cover for half an hour; drain, cover with two cupfuls of cold water and cook ten minutes, strain, add three tablespoonfuls of lemon juice and sugar syrup to taste.
 
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