Rhubarb is really not a fruit, but as it is used in the place of fruit, it is considered under this heading. When thoroughly cooked, it acts as a laxative, but on account of the oxalic acid it contains, I find no use for it in diet for the sick - in fact I find very little use for it in diet for the well. Mixed with dried soaked figs in equal quantities, it makes a good marmalade.