Their new machines. Blakely's treat for the boys. The Professor's car. John in his runabout. The automobile procession. The Chief and the automobile. The cottage for the Chief's family. The boys and the Professor review their work. The great pleasure in their enterprises. George and Harry selected to manage affairs on Venture and Rescue Islands. The copper box. The skull in the package. The Professor announces the return of the reason of the paralytic. The word "triangle" announced by the paralytic. The remarkable coincidence. Opening the copper box. The triangle on the Walter letter. The skull within the copper box. The cryptic signs in the box. The counterpart of the skull they had found. The identical inscription. The agitation of the paralytic at the sight. He mentions the name of Walter. Retlaw enters and starts at the sight of the skulls. Tries to escape on seeing the paralytic. The latter announces his name as Clifford. Harry rightly judges that Retlaw is Walter reversed. Ephraim recognizes Clifford. Walter arrested.

Speculations concerning Walter. Sutoto informed. The mystery of their missing boat. Clifford's story. The paper with the markings on the skull identified by Ta Babeda. The secret in possession of Walter. The boys' suggestion as to proper names for the natives. Surnames, and how originated. The method adopted by the Romans. The Greek names. English surnames. Clifford's condition improving. Trying to identify the skeleton found on Venture Island. Clifford recognizes Ephraim. Walter's letter. The three islands. The triangle. The three southern stars. The southern cross. The three crosses. Thirty leagues. The charts of the islands.

Clifford awakes. The escape of Walter and his recapture. Clifford continues his story. His effort to find the treasure island. His meeting with Walter. Capture by the savages. The Juan Ferde. Blakely and Clifford. His knowledge of the skull. The finding of the boys' boat. Sailing down the river. Loss of the boat. Finding his companions. Sailing to Venture Island. His illness. Meeting with Walter on Rescue Island. His belief that Walter had hidden the chart. Walter brought in. Clifford apologizes to Walter. The Sign of the Plus and V. The chambers in the cave. What the inscriptions meant. Surprise when Walter learns of the finding of the copper box. Explains the meaning of the charts. Why there were three skulls. The mysterious letter. The remarkable happenings explained.

LIST OF ILLUSTRATIONS