246 Geographical Notices. 
few lakes of any considerable extent which have been made — 
known by Captain Strachey, Captain Speke, and Major Cunning — 
ham, as well as those we visited besides, are all salt water. But — 
the explanation we think we must give of this pn oz 
different from the explanation formerly given. me have 
thought that a raising of the country might have caused a general 
drainage. We think that supposition rather improbable, from 
the recent strata round these salt lakes being all horizontal, and 
the outlets of these salt lakes being in a different direction in 
reference to the horizon. If any raising of the country h 
effected the drainage of the salt lakes, the effect would have beet 
a perfectly different one, according to the position the outlet of 
these lakes had in reference to the points of the horizon, a 
modification which is nowhere met with. 
“The 'T’so mo Riri and the Tso mo Gnalari, the two,great silt 
lakes of Rupchu and Pankong, of which drawings are presented, 
happen to be a good example of two large lakes, being about 
equally salt, with differently directed former outlets, and with 
quite horizontal banks of detritus and of watermarks along thelr — 
circumferences. The gradual progress of the erosion of es 
valleys seems to us to be also the chief cause of the gr 
transformation of freshwater lakes into saltwater lakes in Tibet. 
By this progressive excavation thousands of square m 
still marked as former lakes by the form of the surface, have been , 
emptied, and the consequence is that the local evaporation con” 
no more keep the equilibrium with the precipitation; m conse 
quence the lakes, of which parts remained undrained on account 
- their greater depth, now gradually became more an more 
Salt. 
JOURNAL oF THE Royan Gxocrapuicat Society oF Los 
cou ; . We have her 
ountry where British enterprize is manifested President 
Sir R. I. Murchison. To many of the other articles we ee : 
have occasion to allude. The following is a statemen 
ment Surveyor at the Cape—4. Journey from Little Namaque®”’ oe 
ward, along the Orange River, the Northern Frontier of the ' 
