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Analyses of Books . 
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that sulphurous acid was liquefied by Monge and Clouet even 
prior to 1800. Faraday, in 1824, openly admitted that the merit 
of first liquefying the gases belonged neither to Davy nor to 
himself. . 
Touching on the Glacial epoch of geologists, Prof. Tyndall 
rejects the explanations generally given, such as the reduced 
radiant power of the sun, the passage of the solar system through 
a colder region of space, or a re-distribution of land and water, 
so contrived as to lower the temperature of the globe. He de- 
clares that to produce glaciation “ we cannot afford to lose an 
iota of solar aaion,” but want an “ improved condenser.” How 
this condensation was effected, nor what it could have been 
other than a reduction of temperature, we do not find stated. 
In treating of the “ limits of science ” we are gratified to note 
that Prof. Tyndall takes substantially the same view as Prof. 
Du Bois-Reymond. He fully admits that, in passing from the 
region of physics to that of thought, “ we meet a problem not 
only beyond our present powers, but transcending any conceiv- 
able expansion of the powers we now possess.” Here, then, is 
a distindl recognition that mental phenomena cannot be explained 
by the properties of matter and energy. Prof. Tyndall, there- 
fore, cannot belong to the “ Kraft-stoff ” school, and those who 
accuse him of materialism would do well to consider with due 
care the words we have just quoted. 
“ Heat, a Mode of Motion” must be regarded as a most com- 
prehensive and accurate survey of an important branch of Science, 
and all the more valuable because not encumbered with that 
parade of mathematical formulae which renders so many works 
on physics unintelligible save to one particular order of minds. 
Degeneration. A Chapter on Darwinism. By Professor E. Ray 
Lankester, F.R.S. London : Macmillan and Co. 
This interesting and valuable little work is in substance a dis- 
course delivered by the author at the Sheffield meeting of the 
British Association. In the introductory portion we meet with 
the suggestion— humorous, but not the less appropriate— that 
the Association should plainly state what it is seeking to advance. 
There is scarcely a word in the English language so strangely 
and vaguely applied— or rather misapplied— as “ Science.” In 
vain did Prof. Whewell point out clearly and succinctly the dis- 
tinaion between Science and Art, and between Science and 
unsystematised knowledge of faas, objeas, events. We still 
hear the British workman use the term as a synonym for pugilism. 
Persons of culture set our teeth on edge by speaking of the feats 
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