There have now been two instances to my knowledge where someone had problems posting a comment on this blog. Perhaps there are others who have tried to post a comment and were unable. If anyone else has had or has problems commenting, please let me know by e-mail. It is possibly a problem with Firefox or older versions of Internet Explorer and the embedded comment form, which is what this blog has at present. If this is the problem, I will have to change the comment form back to a pop-up window.