The Geological Magazine for February contained a lengthy criticism by Mr. R. M. Brydone of my article on the Recognition of Two Stages in the Upper Chalk, in the volume for last year. It is certainly curious that he should set himself the task of adverse criticism in such a voluminous fashion when he acknowledges at the outset that he sympathizes with my proposal. It appears, however, that he is dissatisfied with my reference to his work, and that he doubts the reliability of my lists of fossils from the new zones of Offaster pilula and Actinocamax quadratus.