It was discovered today that the time and date was incorrect on the listserv server and the time was promptly corrected. Note that messages sent from about 14:00 on Thursday October 17 till about 16:00 on Monday October 21 will have the wrong date on the header. They will look like they were sent on March 9, 1996 to March 13, 1996. Apologies for any inconvenience. Computing Services York University