160 x 105 mm. The caption continues: 'The coral limestone country of the East and South of Zanzibar Island are characterised by large caves. Fine examples of stalactites and stalacmites are often seen and, of course, these caves are often the home of hoardes of bats. This picture shows the entrance to one of the caves which is very nothing more than a hole in the ground with a fifteen or twenty foot drop to the floor.'