Long letter about current state of Tindale's research on halfcastes; his proposed research trips; asking for confirmation that materials sent to Birdsell have been received; note on Dr Lethbridge's physical survey of half castes in NSW. Also reports on Frank Fenner, T.D. Campbell, H.K. Fry and CP Mountford; and various other matters. Attached a list of 'Sexings of Cairns pygmoid skulls and and corrected data on halcastes from their joint research trip.