The story of an expedition for rare black opals in Australia, full of classic Boys\' Adventure stuff (and associated attitudes towards, say, Aboriginal people). With illustrations by William Rainey. Undated, but with a prize plate dated 1927.Condition: Boards shelfworn, corner bumped to card, rubbed and marked, tail of spine frayed. School prize plate pasted to front FEP, some internal hinge splitting, minor marks to foreedges and throughout but all pages readable and binding intact.