Google sites does not allow viewers of the pages to enter comments directly.
You'll have to write to me using the email address tonyklouda at gmail dot com.
If you do comment, and don't want it pasted on any page for others to see, please make that clear in the email. Otherwise I may well post it at the bottom of the relevant page to stimulate debate and further comment.
Sorry about the hassle of doing this!
Tony Klouda