490 General Notes. [May, 
Guiana. The sketch map of Brazil, prepared by O. A. Derby for Vol. 
1 of La Geographica physica do Brazil is a revelation to those 
whose knowledge of Brazil is mainly confined to the Amazons. Not 
one-tenth of the entire country, according to this map, is less than 
300 meters above the sea, and the region above 1000 meters is at 
least half as large as those below 300. The true mountains of 
upheaved strata are mainly in the eastern and central portions of 
the Brazilian plateau, and may be considered as forming two 
groups, separated by the elevated table lands of the Parana and 
Sao Francisco basins. The culminating points of the eastern 
group are the peaks of the Organ mountains in the Serra do 
Mar, and Itatiaia (2712 meters), the highest point in the emp 
The western group consists of at least two distinct ranges, culm 
nating in the Montes Pyreneos near Goyaz. The great tabi 
lands, though composed of horizontal strata, are often so exca- 
vated by the deep river valleys as to have the appearance of 
mountains. On their eastern border, in the provinces of Parana 
and Sao Paolo, they rise to 1000 meters. The water-parting be- 
tween the rivers flowing south and those flowing north is partly 
formed by a transverse ridge across the southern part of Minas 
Geraes, connecting the two groups of mountains, The Tocantins, 
Xingu, Tapajos, and Madeira, all descend from the tableland in a 
series of rapids at from 100 to 200 miles from the Amazon. The 
Brazilian portion of the Guiana plateau is very imperfectly known, 
but some spurs of its highlands extend to within a few miles of 
the Amazons between the mouth of the Rio Negro and the 
ocean 
Muiniion Notes—The Ona of Terra del Fuego are estimated 
by Lieut. Bove at from 300. to 400, and the total number of 
Fuegians, men, women and children in the archipelago, according 
to a careful census made by the English missionary, the Rev. 
Bridges, is given as 949. Mr. E. M. Thurm telegraphed to 
Kew that he has succeeded in ascending Roraima. Capt. 
Eduardo O’Connor has navigated the Rio Negro of Patagonia 
from its mouth in the Atlantic to its source in the romantic Lake 
Nahuel-Hualpi in the Chilian Andes. He was able to proceed by 
steamer as far as the confluence of the Colhincura’ or Catapuliche, 
but beyond that point was compelled to make his way in an open 
boat. The Upper Limay, the furthest southern headstream of 
the Rio Negro, flows over numerous rapids in a narrow rocky 
contracting at some points to 120 or even 100 feet. In 40° 
. lat., beyond the confluence of the Treful, the rapids disap- 
D the stream is deeper and less swift, and navigable for steam 
launches to the lake. The scenery of the alpine basin of the lake 
is represented as charming. The country around appears to be 
_ uninhabited———The Indians who inhabit that part of the Chaco, 
i which he Argentine government has sent an expedition, are 
number about 10,009. Their weapon is the arrow, 
