If I have not paid greater attention to my numerous critics, it is not that I have failed to study them; it is simply that I have remained — obstinately it may be — convinced that the views expressed are, relatively to our present state of knowledge, substantially correct. Such changes in form as I have made have been chie?y suggested by further experience in the difficulties which await both pupil and teacher. I can only conclude by expressing a hope that if old friends meet the Grammar in its new form, they will not be displeased by either the superficial changes or the more substantial additions.