
It was my great good fortune, while I was still a student at college, to have possessed a copy of an English translation of his great work 'The Sensations of Tone.' As is well known, this was one of Helmholtz's masterpieces.
To an observer situated on the moon or on one of the planets, the most noticeable feature on the surface of our globe would no doubt be the large areas covered by oceanic water. The sunlit face of the earth would appear to shine by the light diffused back into space from the land and water-covered areas.