Summary. In a previous article the writer reported an enquiry into the opinion of grammar school teachers in Glamorgan about co‐education. This was centred on the experience of teachers who had taught in both co‐educational and single‐sex schools and was quantitative in type. The questionnaire used was open‐ended, and an account of the qualitative results derived from the comments was promised in this later artiole. A great majority of the comments were in favour of co‐education. These are classified, and several interesting differences between groups of teachers are indicated. Opinions against co‐education are similarly dealt with.