Last of four programmes in which Dr. A. J. (Jock) Marshall in London introduces recordings specially made for the BBC by members of a scientific expedition who have been spending the summer in the Central Highlands of New Guinea
Including a description of the building of a bridge across a river, with comments on the importance of such operations in improving communications in the territory. The programme concludes with recordings made at the ceremonial ' sing-sing ' to celebrate the completion of the bridge