256 R. Mallet—Temperuture attainable by Rock-crushing. 
Toleration also toward those who, on what we think misun- 
derstood or insufficient evidence demand more than we are pre- 
pared to admit, in the hope that they will revise additional 
texts which seem to conflict, or may hereafter conflict, with 
facts deduced from actual study of nature, and thus prepare 
their minds for the reception of such truths as may be dis- 
covered, without embittered discussions. 
Patience, too, must be counseled, for much delay will ensue 
before this desired result is arrived at; patience under attack, 
ere under misrepresentation, but never controversy. 
Thus will be hastened the time when the glorious, all-sufh- 
cient spiritual light, which though given through another race, 
we have ado as our own, shall shine with its pristine purity, 
tek: from the incrustations with which it has been obscured by 
the vanity of partial knowledge and the temporary contriv- 
ances = human polity. 
y freely extended scientific culture, may we kaye 
tions will be removed, which greater age and more despotic 
netics precepts with which he is familiar. anner 
alone may be realized the hope of the pilosa the dream 
of the Ler and the expectation of the: theologian-—a universal 
aiicinnregeaenasomereceat 
Art. XXXIV —On the Temperature attainable by Rock-crushing, 
and its Consequences ;* by Ropert MAuuzt, F.R.S. 
IN developing the theory of volcanic heat and energy em- 
braced in his paper “On the Nature and Origin of Volcanic 
Heat and Energy ” (Phil Trans., Part I, 1878), the main object 
of the author was to prove that the annual work of secular 
contraction in our globe, when transformed into heat, was more 
shai adequate for the supply of volcanic activity existing upon 
our planet. While paieation generally the circumstances 
which must attend as results of the descent of the exterior shell 
* From the Philosophical Magazine for July, 1875. 
