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Baron von Waltershausen’s Work on Mount Etna. 161 
The second part of the work is to consist of a thick qtiarto 
_ volume, containing after a general and scientific topographical in- 
troduction, the astronomical observations made to determine the 
localities, the base measurement and triangulation of the volcano ; 
a minute topographical description of it; trigonometrical and 
barometrical observations to determine its height; an examina- 
tion of its terrestrial magnetism; its mineralogy complete ; a his- 
tory of its eruptions from the days of the Licanians to the 
ent time ; its entire geology, with an account of its origin and 
of the anion it has undergone, as far as they can now be tra 
ced or recognized ; and in conclusion, a discussion of the general 
theory of volcanoes, and a comparison of Etna with the Liguri- 
an voleanoes, Vesuvius, and the volcanoes of the South of Eu- 
rope. This part will be published as soon as it can be prepared. 
This remarkable monograph, on which its author has so disin- 
terestedly spent and is now spending the best years of his life 
and a large part of his fortune, is published wholly at his. own 
expense, and without any expectation of being remunerated for 
his sacrifices, except by the reputation he will earn, and the con- 
Sciousness of what he has done for the great cause of science and 
the progress of intellectual culture. ; 
- ‘Thinking that there may be persons in this country who have 
a spirit like his own, and are interested in similar pursuits, he has — 
sent, we are happy to say, a few copies of the first number of — 
his work in French to a friend in Boston. 'They may be found | 
on sale at Little & Brown’s, booksellers, Boston. We need hardly 
mention that this is the same work of which some early speci- 
were presented by Hon. Nathan Appleton to the Associa- 
tion of American Geologists, at their meeting in Washington in 
1844, and with respect to which resolutions of high commenda- 
tion were passed by the Association. 
- Until the present time the model for jobiories in voleanic eile 
fi been the elegant monograph by Leopold von Buch, the Phy- 
sical History of the Canary Islands, which at the time of its ap- 
“pearance was justly esteemed the most beautiful geological work 
‘ever published. The highest praise that we can offer with re- 
gard to the execution of “Etna and its Convulsions,” is to say 
that the illustrious work of the father of German teblécints has 
been wholly surpassed by the genius and industry of his coun- 
trym = man. zs 
