This is suggested because the site is not composed as a linear sequence of pages, but is internally linked in more ways than could be put in a menu. So it is often difficult to pre-determine which page linked to the current page. If a scroll bar appears on the right-hand edge of the browser, then part of the page may be invisible until it is scrolled up. These pages all end just after a double line. Apologies to those for whom this is already familiar.
Any further hints are welcome, and can be sent to the webmaster by clicking on the name below.