Salvadoran Co-Madre here March 12 Edward Harrison on 'Darkness at Night' -- Edward Harrison on 'Darkness at Night' -- 250 middle, high school dancers here -- Art and corporate America: the jobs are there / Bennett, Johanna -- Observers, women's history this month -- Experiences of a mathematician in industry is topic -- Psychology colloquium set for March 11 -- An insider's view of job opportunities offered -- Gymnast cited for scholastic ability -- To speak on 'Western Literature and Opera' in lunchtime series -- Martin Takes Second Title / Kemmy, Dave -- Will lecture, perform music of French Canada here March 11 -- Calendar of Events