Editorial note — Chapter XV · THE WILL IN INTESTINAL FUNCTION

[Footnote 6: A curious discovery has been made in recent years that orange skin contains a very precious element essential for bodily health, belonging to the class of substances known as the vitamines and contains more of it than any other food material that we have. The instinct which tempted so many of us as children to eat orange skin, in spite of the fact that we were discouraged from the practice, was founded on something much more than mere childish caprice. Orange skin is after all the basis of marmalade which has been so commonly used by the English people at breakfast and which is at once a tasty and healthful material.]