According to the latest statement from Boston Police headquarters the thousand-odd Harvard students who passed through the Yard yesterday morning were in the approximate vicinity of a $15,000 diamond studded "slave" bracelet, which was lost there Wednesday afternoon by Miss Cathleen B. Rice, of Hartford, Connecticut. All day yesterday a special detachment of the police force searched in the Yard shrubbery for the missing ornament, while two inspectors went the rounds of the city pawn-shops. The bracelet has not yet been found, however.