ss Geographical Notices. 223 
“Lieut. Maury naturally ponders with shakings of the head 
‘the remarkable undulations’ of the bottom which this profile 
indicates.” 
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We may be warranted in the conclusion that it is practically im- 
Seesihie to determine the greatest depths of the ocean by the 
NE 
is Baron von Krafft, whose intention is to visit the interior of 
Soudan. 
the route from Ouargla to Djebel Hoggar, a 
never been followed by Europeans. oe eee ee 
| ‘afft to Humboldt, dated April 10, 1858, 
a oes * 
* The following errata in the paper of Prof. Trowbridge were Laaeiroregless 
had gone to press.—Eps. “95” read “96.”—Page 169, in the formula and 
in toe DS et line from top, for | 88 Ja“ V>-—Page 170, 8d line from bottom, after 
“as much as” insert “one-fourth of.” 
giers, expresses the 
