Scattering of Quanta with Diminution of Frequency1 Karl K. Darrow. In this article the author points out that certain phenomena of X-rays recently reported were illustrations of the general process of scattering of light with change in frequency, which had just begun to attract attention owing to important observations made by Raman and others with visible and ultra-violet light. The can tent was amplified and restated in Dr. Darrow's article entitled “Contemporary Advances in Physics, XVII-The Scattering of Light with Change of Frequency,” which appeared in the January, 1929, issue of the Bell System Technical Journal.