National Geographic : 1949 Apr
:) .Naotl ail (Geograpmtc Society 485 Painting by William F. Soare By Means of a Prism Bought at a Fair Newton Discovered Secrets of Light His experiments with the spectrum revealed to his extraordinary intellect that the rays are capable of being differently refracted and that "to the same degree of refrangibility ever belongs the same color and to the same color ever belongs the same degree of refrangibility." From his observations also he developed the corpuscular theory that light is due to a host of tiny particles emitted by a luminous body and moving in space at 190,000 miles a second. He sent his findings on February 8, 1672, to the Royal Society, of which he had just been elected a fellow, and the paper caused an immediate storm of controversy that continued for years. In 1675 he wrote: "I was so persecuted with discussions rising out of my theory of light that I blamed my own imprudence for parting with so substantial a blessing as my quiet to run after a shadow." By permission of the owner, the Bausch & Lomb Optical Company, Rochester, New York, we take our illus tration from a painting by William F. Soare (1896-1929).