282 SIR RODERICK I. MURCHISON’S ADDRESS— EUROPE. [May 24, 1858. 
In carrying out tlie triangulation of tlie Tyrol from Innspruck to 
the frontiers of Bavaria and to the territory of Salzburg, the 
engineers have determined the attraction exerted on the plummet 
by some of the mountains. In relation to one point in the middle of 
the valley of the Inn, and in approaching 530 Vienna toises towards 
the northern range of mountains, the deviation of the plumb line was 
5"* 7. In the opposite direction, or in nearing the more southern 
mountains, or the mass of the Tyrol, it was found that for the spaces 
traversed of 625 and 1333 toises, the corresponding deviations were 
6''*2 and 10'' respectively. 
The Austrian Navy have recently made extensive magnetical 
observations in the Mediterranean, some of the most important of 
which are due to Dr. Schaub, the Director of the Naval Observatory 
of Trieste, who has lately visited London. 
Of other Austrian publications relating to our subject, the most 
important are a book on the general Geography of the Empire, by 
Dr. Schmidt and Professor Waehsmuth ; Von Czornig’s comprehensive 
work on Austrian Ethnography, with a beautiful large map in 4 
sheets ; and Professor Franz Potter’s work on Dalmatia, the most 
complete relating to that country which has yet appeared. 
Other German Researches and Publications . — During the last vacation, 
when roaming through Germany, I did not fail to visit the well 
organized and thriving geographical establishment of Justus Perthes, 
of Gotha, and was much gratified in witnessing the ability with 
which it is conducted. I am indeed glad to inform you that the 
‘ Mittheilungen,’ of which I spoke so favourably last year, has now, 
as I am informed, a sale of 5000 copies per month — a fact highly 
creditable to the German public. Having long lamented that we 
are not sufficiently acquainted with researches relating to Germany, 
or works published by writers of that country respecting other 
lands, I requested Mr. Petermann, the intelligent editor of that 
useful periodical, to furnish me with some data, which I now lay 
before you.* 
* Mr. Petermann has sent me most of the sheets of a Memoir about to appear in 
the ‘ Mittheilungen ’ on the Progress of the great National Maps and Topographical Labours 
of all European Countries, a highly useful work of reference. See also List of the 
“ Principal Maps of Europe ” in our own Map-room. 
Among the works of general interest which have recently been published by Justus 
Perthbs and Co., of Gotha, or are ready for publication, are the following (exclusive of the 
German edition of Dr. Barth’s Travels) : — Lieut. Van de Velde’s large Map of Palestine, in 
8 sheets, based on his surveys in 1851 and 1852, and other accessible materials. Along 
with this map is a comprehensive Memoir, with numerous tables of astronomical and hypso- 
metrical observations, distances, and other data. In connexion with this map, Van de 
Velde and Dr. Titus Tobler have drawn a large Plan of Jerusalem, also accompanied by 
