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Rh of a material discovered by one of our great scientists in the year 4562, which has the extraordinary power of absorbing the light of the sun; and, by another ingenious invention of the same great man, the discharge of this stored light can be controlled in such a way that it is only given off as we require it. A ceiling absorbs enough light in one day to light the building with a moderate, pleasant light for three days and three nights. After this invention all other forms of lighting became obsolete. I do not object to your speaking when we are outside, but please speak as low as you can. Our hearing is very acute, and it is not the custom to speak so loudly as you did in the year 1888. The human organs of hearing must in your day have been but crude instruments, if it required so much exertion on the part of the speaker to make others hear." As I now saw a number of the same type of mortals as those that had acted as my guides gliding about, I asked the Recorder what position these people occupied