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Mineralogy and Geology. 275 
o 
_+he question then arose, What was the physical reason of this great 
difference between the tropical mountains and those of temperate Europe ? 
European and Eastern mountains. He looked to the numerous lakes to 
the north and south of the Alps; and he would put the map of India 
alongside, where the same kind of rivers were debouching into the plains, 
carved out a great lake. This was the theory, or rather hypothesis, 
Which Professor Ramsay put forward to explain the lakes which were so 
abundant in the valleys of the Alps. A similar speculation, but greatly 
More restricted, had been advanced by Martillet a short time before. 
n ced, he 
it with the most li sition i :tion with his own experience 
: vely o ition in connection wit! 
n the Himalayan Mette hen The opposition which he gave to it was 
? See this Journal, [2], xxxv, 324-345, May, 1863. 
