197 
space taken up by the apparatus is very large, and it would, 
therefore, be better to work it in countries where land is of 
small value. The cost of the large amount of ground which 
the installation covers seems to me a factor which will have 
to be taken into account. 
The CHarrman: Gentlemen—The hour is getting late, and | 
will now terminate these proceedings by expressing to Mr. 
Shuman our very cordial thanks for his most interesting paper. 
Mr. Suuman: Gentlemen—I thank you very much for the 
attention you have given to an entirely new subject, and I 
know it will arouse a great deal of thought. One of the 
unfortunate things is that if we want to go into this question 
deeply, and understand everything connected with it, it would 
take in the first place two or three weeks’ thinking over, and 
afterwards a couple of weeks’ discussion to make everything 
clear in detail. We shall learn a great deal more about sun 
power, but we are already in a state of higher efficiency than 
the steam boiler was, comparatively speaking, fifty years ago; 
and the steam boiler had already had about 100 years 
of development before that. There was a time when all your 
coai treasures lay underground in England; nobody knew of 
their worth. They were not even used for burning in houses 
300 years ago, and were not used for mechanical power 160 
years ago. There were all those treasures lying idle, and not 
used at all. Now you have in the tropics a treasure a million 
times more precious, because it is perpetual and can never 
give out. 
