... the rock faces both in Scotland and in Central Australia: on large rocks they are painted, in Australia, in Scotland they are incised.I maintain that there is a singularly strong analogy between ... bestyled, are not necessarily marked with any pattern. In Australia, in Portugal, in Russia, in France, in NorthAmerica, in Scotland, as we shall see, such stones may be unmarked, may bear no inscription ... in Central Australia: and in Caithness, need not have had the same meaning and purpose. {9 5a} It is only certain that the pebbles of the Caithness brochs are as absolutely unfamiliar as the inscribed...