—cssaeasai arias ie ceaaaaiainaatial 
ET. 39.] TO GEORGE ENGELMANN. 373 
plan on which it was commenced seven hundred or 
eight hundred years ago, and in which the choir was 
finished, and the transepts and nave commenced. It 
is most grand ; the grandest thing we ever saw, though 
the nave bears only a temporary roof, at thirty or 
forty feet less than the full height. The ancient 
stained glass comes fully up to one’s expectation. I 
have never seen the like. 
We went up to Poppelsdorf ; such charming and 
picturesque view of the Siebengebirge (seven moun- 
tains) and the Godesberg, ete., from the professor’s 
windows and the Botanic Penden: the museums rich 
and curious, and parts of the old chateau in which 
they are (now surrendered to the university) not less 
so. The botanical professors, Treviranus! and Dr. 
Roemer, very kind ; some collections to be made ready 
here for me to examine when we come back, so that I 
must then spend a day here. . . . 
TO GEORGE ENGELMANN. 
Geneva, August 16, 1850. 
We went up the Rhine to Coblenz, Bingen, and 
Mayence ; thence to Frankfort. By some mistake in 
the post office in giving me the address, your letter to 
Dr. Fresenius? I took to a law-doctor Fresenius, who 
was away in Switzerland. So I gave up all hopes of 
seeing him, and we fell to seeing the sights by our- 
selves, when, a few hours before we had arranged to 
go to Heidelberg, the true Dr. Fresenius came in. 
We may see him again on our way back. We went 
to Heidelberg, for an hour or two only. . 
1 Ludolf Christian Treviranus, 1779-1864 ; professor of botany in 
Bo 
nn. 
2 J. B. G. W. Fresenius, M. D., 1808-1866. Wrote many contribu- 
ov 
