Four free public lectures on Alaskan exploration, baroque and rococo music, political theory, and various aspects of the world's climate, head a busy day for rostrum mounters here this afternoon and evening.

Sargent in Alaska

Aerial mapping in cooperation with the Navy and the results of systematic surveys from 1898 to the present come under the ken of R. H. Sargent, of the United States Geological Survey. Profiter from 25 years of Alaskan experience, he is scheduled to give an illustrated lecture at 2:30 o'clock in the Geographical Institute.

Leichtentritt in the Music Building

Two hours later Hugo Leichtentritt, lecturer on Music, speaks in Paine Hall on "The great masters of Baroque and Rococo Music in their idyllic and elegiac aspects: Bach, Handel, Rameau, Gluck, Haydn, Mozart." Musical illustrations are to accompany this talk, one in a Wednesday series by Leichtentritt.

Husserl and the Philosophers

The Department on Philosophy is, at 4 o'clock in Emerson Hall, sponsoring Professor Gerhart Husserl, formerly dean of the Law Faculty in the University of Kiel, who chooses "The Political Community vs. the Nation" for his address.

Climate Symposium

Then in the New Lecture Hall at 8 o'clock three of the University's leading scientists join in a symposium on "Climate in the Living World." Participants, sponsored by the Gamma Alpha scientific fraternity, are William C. Darrah, Research Curator of the Botanical Museum and instructor in Botany; Kirtley F. Mather, professor of Geology; and Derwent S. Whittlesey, associate professor of Geology.

Tozzer in Central America

Also a free lecture tonight, the "great civilization evolved by the Mayan Indians of Central America before the coming of European settlers to the western hemisphere" will be outlined by Alfred M. Tozzer '00, professor of Anthropology, in the Geographical Institute at 8 o'clock.

Lantern slides will help describe the highlights of several years' excavations in Yucatan and Guatemala.

Weston and Leopardi

Bringing Italy into the day's picture, George B. Weston '97, associate professor of Romance Languages, will commemorate Giacomo Leopardi on the centennial of his death, at 7.45 o'clock in Phillips Brooks House.

Under the auspices of the Circolo Italiano, the tribute to the poet is the first in Massachusetts.

For Japan

For the Japanese, Professor Kiyoshi Shiratori, of the Peers' College of Tokyo, lectures on "The Origin of the Japanese Race and the 'Utsutsu-Gami'." Shigeto Tsuru '35 will interpret Professor Shiratori's words which are to be delivered in his native tongue. The place is Emerson 211 and the time 3 o'clock.

Guardian On Air

In its third regular Wednesday evening broadcast, the Guardian tonight introduces Wassily W. Leontief, assistant professor of Economics, who speaks on "The National Income." Station WAAB and the Colonial Network carry the lecture at 9 o'clock.

Professor Leotief will discuss the many different interpretations possible with their practical applications to present economic problems.