PROGRESS towards the solution of many building problems is recorded in the annual report for 1938 of the Building Research Board recently issued by the Department of Scientific and Industrial Research (London: H.M. Stationery Office. 3s. 6d. net). One of those pressing most urgently for investigation is that of sound transmission in buildings, and in this sphere of activity the report claims that the position of these inquiries has been very much advanced during the past year. It has been made clear that in buildings with a normal continuous rigid construction it is virtually impossible to obtain a higher degree of sound insulation between two neighbouring rooms greater than that obtainable with 9-inch brick walls on a concrete floor resting on sound insulators. Reviewing, therefore, the results of experiments in the small steel frame building at the Research Station, in which various types of construction can be tested, it is claimed that practical suggestions for construction to cut down sound transmission can now be advanced.