BOOK II.

THE SECRET OF THE LABORATORY.

XV. THE BEGINNING OF CHANGES 158

XVI. A STRANGE VISITOR 169

XVII. TWO CONVERSATIONS 181

XVIII. SUSPENSE 193

XIX. A DISCOVERY 205

XX. THE DEVIL'S CAULDRON 213

XXI. IN THE LABORATORY 232

XXII. STEEL MEETS STEEL 239

XXIII. A GROWING HORROR 249

XXIV. FATHER AND CHILD 261

XXV. EDGAR AND FRANK 272