Ultraviolet quickly than violet light itself. He called them "oxidizing rays" to emphasize chemical reactivity and to distinguish them from "heat rays", discovered the previous year at the other end of the visible spectrum. The simpler term "chemical rays" was adopted shortly thereafter, and it remained popular throughout the 19th century, although there were those who held that these were an entirely different sort of radiation from light (notably John William Draper, who named them "tithonic rays"). The terms chemical rays and heat rays were eventually dropped in favor of ultraviolet and infrared radiation, respectively. In 1878 the sterilizing effect of
In the House of Stone and Light (album) As stated in the EPK, "Shape the Invisible" is Page's favorite on his debut album. As described by him in his video EPK: "My favorite song is 'Shape the Invisible', purely because of what the lyrics say. I was reading a book about Leonardo DaVinci and he mentioned that this shape the invisible in a sentence, and I thought what a great title. And at the time I wrote the song, there is as there always is trouble in the world, and I really wrote it as a wish song." Also stated in the EPK by Page, about the song