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Biographical Sketch of Dr. Karl Ritter. 229 
and the chief reason for it was, that his official duties claimed 
his attention more and more. Accordingly he entered, thoug 
only for a short time, as a member, the scientific examining 
commission for history and geography, and soon after the death 
of his friend Woltmann he also undertook the historical lectures 
atthe Military School. 
In 1825 he was appointed Director of Studies to the corps of 
cadets. Besides, he instructed Prince Albrecht of Prussia in his- 
tory for many years, and received, especially during the winter 
months, frequent invitations from the Crown-Prince to lecture 
on history and geography before him and some of his nearest 
relatives and friends. Similar invitations came also from other 
es, and he very often complied with them. Thereby a very 
considerable part of his time and strength was claimed, as he 
was always wont to apply the utmost care and scrupulousness 
toall his subjects. Nevertheless by his extraordinary diligence, 
which was a necessity to him, assisted by a robust healthy body 
and by his collectedness and freshness of mind, he still found 
leisure to work and to promote and advance his scientific labors, 
Which were never lost sight of. The external fruits of these 
rs were however confined in that period, to his reports in 
for 1824. fany of the results of his studies were communica- 
oa the geographical society, which he, in 1828, had founded 
chi 
eee Oe Dart of summer. The most extensive and important 
heck, a tour to Greece, Constantinople, through Bulgaria, Wal- 
th la, Sieben-Burgen and Hungary; repeate travels to Paris, 
is the southern, and at another time, western part of 
ranee, and the Pyrenees; through Belgium and Holland; 
4. Southern part of Germany, the system of the Alps in its 
rlerent parts, Switzerland, and the northern part of Italy. The 
and 's of these journeys were a great variety of impressions 
observations (mostly recorded and narrated in his detaile 
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