388 J. L. Smith—Daubrée's Raperimental Geology, 
hygrogen acting on the rocks at a more or less elevated temper- 
ature; how high the temperature was it is impossible to decide. 
e says: “It was without doubt an elevated temperature, 
because the anhydrous silicates, as olivine and pyroxene, are 
the products; yet at the moment of solidification and crystal 
lization, the temperature appears to have been inferior to that 
small confused crystals, notwithstanding the extreme tendency 
of the minerals to crystallize. Beside this production of small 
confused crystals, there is a manifest tendency for them to 
assume a globular form.” 
The author compares meteorites with the rocks of our globe 
and brings out the contrast in a striking manner, aes = 
- and in these 
that are to be 
various lights by the author. : 
