The Social Service Committee will conduct an excursion to the House of Correction at Deer Island this afternoon. The party will start from Phillips Brooks House at 1.30 o'clock. The steamer "J. Putnam Bradlee," which the Penal Institutions Commissioner has offered for the use of the party, will leave Eastern Avenue Wharf, north side of South Ferry, at 2.15 o'clock, and, returning, will arrive about 5 o'clock. The excursion will be open to members of the University.