THE work of men of science has laid the foundation for a great many improvements in the technique of building, and this is, perhaps, most directly evident in the domain of physics. The utilisation of energy in the forms of heat and electricity form striking examples, but little has been done in this country in connexion with the control of sound. This is somewhat curious since in the late Lord Rayleigh we possessed one of the greatest exponents of acoustics. With the present-day congestion of our towns, which seems to be an inevitable factor in the progress of civilisation, the reduction of noise becomes of constantly increasing importance, and the present financial loss due to this cause must be very great, though probably impossible to estimate. Need also exists for investigation on the most efficient means of propagating sound in order to secure its most effective transmission and reflection.