IN his presidential address to the Society of Glass Technology, delivered on April 14, Dr. S. English discussed “The Commercial Use of Scientific Data”. After a brief review of the rapid development of the science of glass technology during the past twenty-five years, and the importance of the results obtained in their application to manufacturing processes, the problems of illuminating glassware of the diffusing type were considered in detail. Three essential requirements of such glassware are that it should be (1) practicable from the manufacturing point of view, (2) technically correct from the illuminating point of view, (3) artistically correct. The problem of glare was emphasized in relation to the adaptability of the human eye to an enormous range of illumination intensities from 2,000 to 4,000 ft.-candles on a bright summer day to 0-002-ft. candles for A. R. P. lighting. Diffusing glass envelopes reduce the glare and increase the detail comprehended by the eye by removing the intensely bright source from direct vision.