TWO PROFESSORS TAKE SABBATICALS

Two Harvard professors who will have Sabbaticals during the year 1927-28 have announced that they will go abroad to do research work. L. C. Graton, Professor of Mining Geology, will study rock and ore formations in the world's deepest mines; and O. D. Kellogg, Associate Professor of Mathematics and Chairman of the Board of Tutors in the Division of Mathematics, will study tutoring in Mathematics as conducted in Cambridge University, England.

The deepest mines in the world are in Brazil, South Africa, South India, and Yorkshire, England. The deepest, a gold mine named "Village Deep", and situated in South Africa, in the Penne District, is 7032 feet below the level of the ground. This and many others will be visited by Professor Graton during his year of sojourn. He will visit every mine in the world that is over one mile deep.

Professor Graton plans to study ore deposition and behavior of rocks at different depths, in order to be able to calculate the conditions that exist at still deeper depths. In addition to places mentioned above he will visit mines in Spain, Peru, Bolivia, Chile and the Belgian Congo. He is being financially aided in this research work by the Bureau of International Research. At the conclusion of his work he will write several articles for scientific publications.

Professor Kellogg will spend some months in England studying and visiting many well-known mathematicians. From there he will journey to Geneva, Switzerland; from which throughout the remainder of his stay abroad he will make excursion study trips to Berlin, Hamburg, Paris, Poitiers, Rome, Hungary, and Poland. In each of these places he will visit famous professors of mathematics and will study.

Both of these Professors will return to their duties at Harvard in the summer of 1928.