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134 Scientific Intelligence. | 
formed has by its reaction with the lime salts of the ancient ocean, given 
rise to sea-salt and to the carbonate of lime with which the limestones have 
been built up. The aluminous silicate set free in the decomposition of 
i nd_sea-salt 
are unknown, while in higher formations, argillites and schists with kyan- 
ite, chiastolite and staurotide abound, as well as chlorite, chloritoid, mus- 
they have only attempted to extend and develope. We may here observ? 
that the same reviewer fails to apprehend Mr. Hunt’s views on the forma 
tion of crystalline rocks, when he says that Bischof and Hunt agree 2 
supposing all rocks to be formed by chemical agencies in the presence ° 
water, and that therefore the latter cannot claim originality. Now upom 
point in question there is little or no affinity between the views of the 
two writers, for the simple reason that Bischof seems never for a moment 
to apprehend the nature of the great problem which Mr. Hunt has unde! 
