Wilkie Collins has given us in this novel one more instance of his strange capacity for weaving extra plots. Armadale, from beginning to end, is a lurid labyrinth of improbabilities. It produces upon the reader the effect of a literary nightmare. Miss Gwilt, Mrs. Oldershaw, and Doctor Le Doux of the Sanatorium are enough to make any story in which they figure disagreeably sensational; and Mr. Coll...