This section is from the book "The Relation Of Food To Health And Premature Death", by Geo. H. Townsend, Felix J. Levy, Geo. Clinton Crandall. Also available from Amazon: Clean Food: A Seasonal Guide to Eating Close to the Source with More Than 200 Recipes for a Healthy and Sustainable You.
"The plum is a nice fruit, makes most delicious preserves and jam."
"Doubtless a good many disorders have been produced by the plum, because they are so often tough, acrid, and therefore unsuitable for food; but choice varieties of plums that have been ripened on the tree are both delicious and wholesome, provided of course, the tough skin is not swallowed."
"They are very similar to the peach, only as a rule they are more acid. They usually contain a little less sugar, and about the same amount of gum. The per cent, of acid in the plum is ordinarily about 1½ and nearly double that of the peach. Some varieties of the plum are quite astringent."
"Yes, the prune is really a plum, but a sweeter variety than the ordinary Damson or Green Gage plum."
"The prune contains a large amount of sugar, and it is supposed to be very laxative, but it has been much overrated in this respect. It has no properties to cause it to be more laxative than most other fruits, and careful observation will show that it is not so in practice. Prunes should be very well stewed, as otherwise they are unfit to eat. The removal of the tough skin by straining the pulp adds greatly to their food value."
 
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