The grains of corn, such as wheat or oats, make an excellent substitute
for coffee if dried and browned on tins over a fire and then bruised
or ground up. So do small beans of the haricot variety. They may be
crushed between stones and then roasted in a pan over the fire, and
boiled with water, the liquor being poured off clear. All raw fruits
and root vegetables like potatoes are preventives of scurvy, and dried
fruits like peaches and apples are excellent sustaining food on a
march, while dried raisins are better than all.