Change in Comment Settings

Due of a stream of "anonymous" comments to my last post having nothing whatsoever to do with this blog, I have (hopefully temporarily) reset my comment settings to "registered users". I know from experience that this setting makes it harder for many people to leave comments on blog postings, but I don't know any other way, short of screening every comment, to put a stop to Mr. Anonymous. I'm hoping that he/she will grow tired and take his/her annoying behavior elsewhere and that I will be able to reinstate the "general" comment setting soon. In the meantime, thank you for your patience!