14/23 Our spectrum already consists of twelve colours visible to the naked eye, and at least five more are distinguishable through our powerful magnifying glasses." St.George was silent. It was as if he had suddenly been permitted to look past the door that bars and threatens all knowledge. He drew out first a quantity of paper of extreme thinness and lightness on which, embossed and emblazoned, was the coat of arms of the Hollands--a sheaf of wheat and an unicorn's head--and this was surmounted by a crown. And here chances to be a letter from your father containing some instructions to me. It is true that writing has with us been superseded by wireless communication, excepting where there is need of great secrecy. |