Most likely there are still links to these pages somewhere. As long as someone links to the page, and the page returns a 404 message, Google will try to index the page. 404 messages do not indicate that the page is gone. Instead, it indicates "the document is not currently accessible. However, keep trying, because it might come back." To indicate that the document is gone permanently, your server would need to return a 410 code. Unfortunately, most webmasters do not know how to return a 410 error message. You would put the following line in your .htaccess file:

Redirect 410 /ess01/sx030002.htm

(Repeating for as many pages as are Gone.)

However, if you have links to these old pages, you may not want to waste the link juice. In most cases, it would be preferable to use a 301 redirect to send the traffic to another appropriate page on your server. This preserves page rank, and will also keep any visitors that follow the outdated link.

Redirect 301 /old/page.htm http:// site.tld/new/page.htm

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The best way to learn anything, is to question everything.