This section is from the book "Cooking For Profit", by Jessup Whitehead. Also available from Amazon: Cooking for Profit.
Sherbets are water ices with either calf 'sfoot jelly or gelatine or white of eggs, or dissolved gum added to make them smooth and capable of being beaten to a light and foamy condition. We give examples only of the use of white of eggs, it being the simplest and most generally available, A remainder of table jelly of the kind usually made for hotel dessert can be used in the same way.
 
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