It has been known for some time that Mr. Lang has added ghosts to his hobbies. In the volume before us, " The Book of Dreams and Ghosts,'' Mr. Lang offers a large collection of ghost stories old and new, and his opinions on "appearances." As far as we can gather Mr. Lang's attitude from these pages, which have much of the vagueness of expression that goes with memoirs of the supernatural, he disbelieves in traditional ghosts, the ghosts that do things-but wishes it were otherwise. Like all persons of poetical or romantic temperament, he would prefer to believe in them. They would make life so much more interesting and exciting.