In his valedictory address as President of the Edinburgh Geological Society, at the close of the session 1879–80, Mr. Milne Home reviewed our recent paper on “The Glaciation of the Shetland Isles.” In his address he not only called in question our conclusions regarding the direction of the glaciation of these islands, but likewise referred to the discordance between the observations of Mr. C. W. Peach and ourselves. As much of this adverse criticism is based on a misconception of the real nature of the evidence bearing on the question, we are anxious to reply to some of the points in the address which might mislead those who are unacquainted with the subject.