In his fair and courteous paper on the Evishanoran Esker, Tyrone, which appeared in the October issue of this Magazine (p. 451), Professor J. W. Gregory finds himself unable to accept the writer's view of the origin of this glacial feature and re-states at greater length the theory he had earlier formed. Though the area under discussion is very small—only one or two of the 4,000 sq. miles described in my paper on the Glacial Geology of the north-west of Ireland—the importance of the principles involved in this disagreement of views necessitates a reply, however brief, to the criticisms of my interpretation to which I still unrepentently adhere.