"A Pair of Blue Eyes," Mr. Hardy's third novel, gives the heart history of a rather susceptible but very charming young lady, Miss Elfride Swancourt, who, by the way, is said to be unpopular with her own sex. It has at least one strong character, Henry Knight, the reviewer, Elfride's second lover. It contains also one very powerful scene, the rescue of Knight from the cliff through the heroism and...