The Unknown Quantity: A Book of Romance and Some Half-Told Tales

According to Wikipedia: "Henry van Dyke (1852 – 1933) was an American author, educator, and clergyman… He graduated from Princeton University in 1873 and from Princeton Theological Seminary, 1877 and served as a professor of English literature at Princeton between 1899 and 1923. In 1908-09 Dr. van Dyke was an American lecturer at the University of Paris. By appointment of President Wilson he became Minister to the Netherlands and Luxembourg in 1913. He was elected to the American Academy of Arts and Letters and received many other honors."