Music is the subject that commands the Vagabond's attention today, for there are opportunities to enjoy demonstrations of both the theory and the practice. The scientific explanation of music will be made available when Professor Spaulding gives the first of a series of lectures on "Sound and its Relation to Music" at 4 o'clock in the Jefferson Physical Laboratory, Room 1, on the subject of "Vibrations". Having mastered the factors that distinguish symphony concerts from the more subtle music of the sounds emitted by, say, the Harvard Square traffic, the musically inclined can obtain a practical exposition of the art by attending the first of the Whiting concerts, to be given at 8.15 o'clock in Paine Concert Hall of the Music Building. Mr. Whiting will offer selections on an instrument not often heard nowadays, the harpsichord, and will be accompanied by Miss Collins, soprano, and Mr. Barriere, flute.

Lectures of interest today and tomorrow include:

TODAY

9 o'clock

"The Political and Social Philosophy and Mencius", Professor Porter, Sever 25.

11 o'clock

"Plridias", Professor Chase, Fogg Lecture Room.

12 o'clock

"Merchants and Middlemen of the Middle Ages", A. P. Usher, Widener U.

"Gluck and Opera Reform", Professor Hill, Music Building.

"Glacial Stages of the Past", Professor Mather, Geology Lecture Room.

2 o'clock

"European Central Banks", Professor Williams, Harvard 6.

"The Classic Element in Medieval Narrative", Professor Rand, Sever 14.

4.30 o'clock

"Expressionism in Germany", Professor Pauli, Fogg Lecture Room.

TOMORROW

10 o'clock

"Early American Drama", Professor Murdock, Harvard 2.

"Haydn and the Sonata Form", Professor Spalding, Music Building.