C. Abbe on the Repsold Portable Circle. . 207 
Art. XXV.—The Repsold Portable Vertical Circle; by 
CLEVELAND ABBE. 
ir 
has already been distinguished by the suggestion of quite new 
thods and instru- 
ments in use in Kurope. It seems that a part of our national 
school of practical astronomy and geodesy that grew up under 
him at these two places, and is now officially established at the 
partment; of great value also is the accurate survey of inter- 
national boundary lines,—but the general survey and mapping 
of the interior presents a problem not dissimilar from that whic 
18 being solved by the Russian geographers for their own land. 
