The criticisms which appeared in the January and February Numbers of the GEOLOGICAL MAGAZINE, on certain writings of mine, require some reply. It is obvious that when an author ventures in any way to question or remark upon the results of others, he must expect their opposition to his statements. I have to offer a general apology to all authors on whose writings I have ventured to make critical remarks in the “Annals of British Geology,” that I was unable to send them proofs of the articles before publication, as I hope to do in future, as long as the work is continued. In that way misunderstandings would be avoided. However, I must now proceed to business.