THE PRESIDENT, introducing the lecturers, said he had known Professor Sparkes very well for many years. After graduating at the University of Bristol in 1932, he had worked for Dorman Long & Co., Ltd., where he had learned much about structural steelwork. Col. Kirkland remembered him there, particularly for his most brilliant handling of a compound loading problem solved by calculus. He had shown Professor Sparkes an arithmetical solution ; since then he had been a most able collaborator and a very dear friend. The Authors presented the paper, which was illustrated by many slides.