Didn't Einstein once say, "The trouble with chemistry is that it's too hard for the chemists", or something like that? If so, can someone supply a reference? -P. ********************* (Note new snail-mail address.) ********************** * Peter S. Shenkin, Chemistry, Columbia U., 3000 Broadway, Mail Code 3153,* ** NY, NY 10027; shenkin(-(at)-)columbia.edu; (212)854-5143; FAX: 678-9039 *** MacroModel WWW page: http://www.cc.columbia.edu/cu/chemistry/mmod/mmod.html