All Houses and auxiliary police are preparing for the 30 minute test air raid and blackout which is scheduled for next Thursday evening. Leverett has already announced a trial blackout to be held Wednesday, and the other Houses are laying plans for similar trials, according to Leigh Hoadley, Master of Leverett House and chief warden of the House precinct.

In order that they may be sure of their way when the College is blacked out, the auxiliary police had a dress rehearsal yesterday afternoon in which they were assigned to the posts that they will occupy during next week's test.

They will be issued special flashlights with dark red lenses that are suitable for use in a blackout. Billies, modeled after the ones used by the Navy, also will be distributed, and an attempt is being made to secure crash-proof helmets.