Report on Progress of U. S. Explorations and Surveys. 381 
Clarke, 1804-6, Long, 1819-23, and many of a more recent date, 
have been collated and employed. Although much information 
A uw 
one thousand and fifty feet; beyond that depth it could not be 
carried. Apprehensions are even entertained as to whether the 
ia. would ; 
€ depth originally intended. 
2. ‘The fell voy 
the West has been completed, and the report and maps are now 
8. The explorations recommended for the next season are the 
*xamination of the interior of N ebraska, especially the sources 
of the Yellowstone: the region along the San Juan to its june- 
trail from that river to Abiqui; the route across the Sierra Ne- 
ae n 
Prac: C: F. W. Dieterici, Director of the Statistical Bureau 
He » Presented to the Berlin Academy of Sciences in ait, 
in Pp, an estimate of the population of the bod which is pri 
Pe artic] 
as — ent races and religions. Dr. Petermann has accom- 
the comparative density of the 
fire, the glo e eminence of Dieterici as ast 
8¥¢8 peculiar ‘es ae estimates. We quote his results, 
> 
‘ie 
