The manner in which the electric resistance of cobalt varies with high temperatures does not seem to have been studied with any great care. The peculiar behaviour of iron and nickel as regards their change of resistance with temperature is now well known With a view to discover if cobalt presented any similar peculiarity, I set Mr Ōmori, one of the physical students in the Imperial University, Japan, to investigate the question. The chief results are embodied in the present short paper.