Professor Spalding Today.

Professor W. R. Spalding will give the fourth of his series of weekly, lectures in reference to the Boston Symphony concerts, at 4.30 o'clock this afternoon, in the Lecture Room of the Fogg Museum. He will speak today on "Fundamental Principles of Musical Form," illustrating the talk by selections played on the Aeolian Orchestrelle.

The lecture will be open to the public.