The Commercial Exhibit at the meeting of the Radiological Society of North America held in Boston, Nov. 30 to Dec. 5, 1947, was a great success, as judged by the interest shown by both visitors and exhibitors. Unfortunately, there was not sufficient space to accommodate all would-be exhibitors. Despite the rationing of space to the exhibitors who were present, all of them managed to present displays that attracted a great deal of attention. Note-worthy trends in the line of x-ray equipment were the substitution of push buttons for toggle switches and increased facility of servicing the control stands. Ansco Corporation (Binghamton, N. Y.): Ansco had an interesting exhibit of color sense determination test plates. By means of colored dots, one was able to determine whether his color sense was normal or abnormal, the normal eye reading certain numbers, while the abnormal eye saw different numbers. Some beautiful colored prints made on Printon and effective color transparencies were also shown, and lights, c...