The third and last of a series of concerts of chamber music, given by Mrs. S. H. Coolidge, free of charge to students in the University and Radcliffe College, under the auspices of the Department of Music, will be presented by the Lets Quartet in the John Knowles Paine Concert Hall of the Music Building tomorrow evening at 8.15 o'clock.

This quartet, which is quite well known in Boston, is composed of Hans Letz, first violin; Sandor Harmati, second violin; Edward Kreiner, viola; and Percy Such, 'cello. The program will consist of three numbers, a Quartet in A minor by Fritz Kreisler, the variations of "Death and the Maiden." from Schubert's Quartet in D minor, and Quintet for strings and clarinets, Opus, 115, by Brahms.