Members of the Harvard and Radcliffe choirs will give a vesper service in the First Congregational Church of Cambridge, at the corner of Mason and Garden streets, tomorrow afternoon at 4.30 o'clock. This is the second of these choral services, which are held under the direction of Dr. Davison. It is the aim of this choir to preserve as far as possible examples of the best church music of all schools. All members of the University are cordially invited.