Letter to Sir Archibald Geikie from George Barrow concerning Geikie's wish to investigate the grounds for Barrow's assertion that the Loch Tay limestone and the Blair Atholl series are not on the same horizontal plane. He recommends that Geikie start his investigation at the Spital of Glenshee and recommends some accommodation there. Barrow lists the ascending stratigraphy which Geikie should observe, with additional notes on some of the apparant features. He offers to take Geikie over the series in his own area so that he can see that they are identical to those at Blair Atholl, except in their degree of metamorphism.