Among the leading lectures at the one hundred eleventh meeting of the Eastern Association of Physics Teachers to be held tomorrow in the Jefferson Physical Laboratory will be one on the development of the talking moving picture by Dr. John Mills, who has been active in experimenting on this subject.

The meeting will open with the election of officers for the ensuing year.

At 10.30 o'clock B. L. Cushing of the Mechanic Arts High School. Boston, will make the Annual Address of the Vice President on "The Work of the Engineering Materials Laboratory, Burau of Standards, Washington, D. C." At 11 o'clock Professor N. H. Black '96 of the Physics Department will give a demonstration of new projection apparatus to be used in the physics laboratory. Professor Vannear Bush, of Massachusetts Institute of Technology, will then speak on "Certain Recent Developments in Machine Analysis." At 1 o'clock the meeting will adjourn to the Colonial Club, at 20 Quincy Street, where it will be the guests of the Physics Department at luncheon.

The afternoon program of popular interest, will be open to the general public. At 2 o'clock Professor John C. Slater '24 will speak on "Recent Developments in our Theories of Atomic Structure." Professor Slater is a leader in the field of theoretical physics and has worked in Bohr's laboratory in Copenhagen. He has an unusual gift in making seemingly difficult and abstruse subject appear very easy and clear.

At 3 o'clock Dr. John Mills, Director of Publications, Bell Telephone Laboratories, New York City, will lecture on "The Photo Electric Cell and its Uses in Communication", illustrated by talking motion pictures. Dr. Mills is a writer on scientific subjects who is already well known through his popular books, such as "Within the Atom" and "A Radio Engineer's Letters to His Son." The photo electric cell is the key to much of the recent development in television and talking motion pictures