Astronomers Will Preside At Scientists' Symposium

Five members of the Harvard Observatory staff will be among the ten scientists speaking in a symposium on "Progress in Astrophysics" in Philadelphia Friday under the auspices of the American Philosophical Society and the Franklin Institute.

Professor Harlow Shapley, director of the Harvard Observatory, will preside at the morning session. Dr. Donald H. Mensal will speak on "Problems of the Solar Atmosphere."

Dr. Cecilia Payne-Gaposchkin will discuss "Variable Stars" and will present results obtained recently at the Harvard Observatory through the activities of the Milton Bureau, a large enterprise in the study of variable stars supported by a grant from the Milton Fund of Harvard University.

Dr. Fred L. Whipple will speak on his new collisional theory of the origin of supernovae and Dr. Dorrit Hoffielt will report on current photometric studies of the supernovae in external galaxies, a research based on studies of photographs made at Harvard's three observing stations.