Update: The Illustrations site is being reconstituted at 

http://illustrations.altervista.org/

An advantage of this host is that it has the power to maintain a genuinely useful alphabetical index of the subjects of the pictures, thanks to a clever plugin called “Multi-column Tag Map.”

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Do not visit illustrations.byethost.com, which was Dr. Boli’s collection of illustrations from public-domain sources. Byethost.com is now redirecting the site to advertisements, all of which seem to be scam sites of one sort or another. There is no explanation from Byethost, except for a few emails mentioning that the site had become “very successful” (it averaged three visitors a day, and its highest number of visitors ever was twenty) and we might want to “upgrade.” We have removed the site from the list in the right-hand margin. If the site becomes available again, it will be put back in the list.

The illustrations themselves are not lost; they were all hosted on separate image servers. If you used any of them on a Web site, they should still be available.