Jim, is Grainger's collection available anywhere in an accessible form?

I suspect Grainger had quite a complex relationship with Britishness and the empire. As an Australian he was patronised and made to feel provincial in England; and after studying in Germany he came to loathe all things German, but then emigrated to the USA in the first world war so as not to have to fight. He seems to have greatly admired the aboriginal peoples he had contact with, albeit in some sort of 'noble savage' way.