160’ Baron von Waltershausen’s Work on Mount Etna. 
As soon then as he could make the large arrangements necessary - 
for his undertaking, in 1835-6, he hastened to Sicily, carrying © 
with him such draftsmen, surveyors and other assistants as could 
be useful. He was delighted with the region so admirably cho- 
sen for enquiries intended to enlarge the boundaries of science, 
and establishing himself on the highest habitable point of the 
voleano, devoted himself with the greatest zeal, self-denial and _ 
perseverance to his task, until he had completed the most ample 
topographical and geological maps of the whole country, investi- 
gating at the same time its peculiar character with great muinute- 
ness, and preparing drawings and sketches of every thane: that 
could illustrate his discoveries or their results. 
- In this great work he and his assistants spent; seven ‘years, un- 
til the “mad German,” as the ignorant part of the population 
sometimes called him, had become as well known to the sail 
tants of the island as the mountain itself. ~ 
“At last in 1842, he returned to Germany, carrying with him a 
great work which he had completed amidst much personal expo- 
sure, peril and suffering, without support from any European gov- 
ernment, and sustained only by the love ef science and his own 
_ strong will. This work he is now publishing both in Germai 
_ and French, under the title of “ Etna and its Convulsions.” It 
_ is when completed to consist of two parts. The first part. is to 
be an atlas folio volume of engravings, containmg 1. A topo- 
graphical chart of Etna and its neighborhood, drawn in the pro- 
portion of 1 to 50,000 in., from trigonometrical surveys made by 
himself, or under his own. supervision, on 15 large folio sheets. 
2. A corresponding geological map on 15 similar sheets, and 3. — 
About 54 large engravings of views, sections and other sketeh- 
€s appropriate to the illustration of the whole subject; explana- 
tions of the plates accompanying each. The first number: of 
this part.of the work was published in Géttingen in 1845, and» 
beautifully engraved by artists of much merit, one of whom, Ca- ~ 
vallari, Baron von Waltershausen had in his service in Sicily, 
and took with him to Germany on account of his great skill 10 
this particular department of topographical drawing and engrav- 
| ang. Five other numbers will’ follow at intervals of a year, ma- 
— an femee one bipiee of each. of which will be seven a 
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