Dear Mark, Funny you should say that....The Xiograph picture was in vogue in some dental publications around the turn of the 20th century. It was an oral x-ray picture used as a negative and printed on photographic paper - and eventually reproduced in the textbooks. I particularly remember some of Edmund Kells' work. The pictures are quite disconcerting for a professional to look at -we're so used to doing our diagnosis from the negative. Poor old Edmund was from the generation of dentists that held the films in the patient's mouths with their own fingers whilst snuggled up next to the Crook's tube. He eventually ended up with fewer fingers than when he started - quite a lot fewer. Explains why I duck behind a brick wall when I press the button! Uncle Dick BDSc ( WA ) ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.