An association, devoted to the study and practice of the best orchestral music, classic and popular, has just been formed in Cambridge, under the name of the Cambridge Orchestral Society. Its officers are: President, Dr. H. L. Chase; vice-president, Mr. Justin A. Jacobs; secretary, Dr. J. M. Keniston; conductor. Mr. W. E. Thomas. The orchestra is composed of resident musicians, and numbers so far about 30, with many applications for membership. New members are only admitted upon evidence of their proficiency in music, as well as moral character. Rehearsals are held every Saturday evening. A concert will be given by the society in Union Hall, on Tuesday evening, Feb. 14, at which the full orchestra will appear in selections from works of Balfe, Beethoven. Bial, Hasselmann and Waldteufel, and Mrs. H. A. Knowles and Mr. N. M. Brigham will assist.