THE RIO MANSO 
feet deep. There was a thick growth of vegetation—a 
belt some hundred yards wide — on both banks of the 
river. The Rio Manso was there at an altitude above the 
sea level of 1,150 feet. 
I took observations for longitude and latitude by 
double altitudes at that place. (Latitude 13° 53' south; 
longitude 55° 13' west.) I had to halt there one day in 
order to give the animals a rest, after the long and reckless 
march of the previous day—a distance of forty-two 
kilometres. 
The source of the Rio Manso was to the east-southeast 
some 120 kilometres from the place where we crossed it. 
Where we encamped it received a small streamlet, flowing 
over a bed of laminated, igneous rock and several suc¬ 
cessive strata of slate, which in some places were in a 
vertical position, in others at an angle of 40°. I noticed 
this vertical foliation and these laminated strata all over 
the great depression we had crossed in order to reach the 
Rio Manso. 
The Rio Manso, which flowed into the Cuyaba River, 
was not to be confounded with the Rio Manso forming the 
head-waters of the Rio das Mortes, which eventually 
threw itself into the river Araguaya. 
Owing to one of my animals having strayed away and 
the difficulty of finding it again in the tall grass and high 
vegetation, we were not able to leave camp until the after¬ 
noon of June eighteenth. Soon after starting on the 
march we went through a marvellous arch of thick foliage, 
creepers, bamboos, and dkuri palms, previous to crossing 
a streamlet nine metres wide and one foot deep, flowing 
towards the west. We had no end of trouble near these 
streamlets, as they flowed between precipitous banks fifty 
to seventy feet high. There was no trail. The animals fre¬ 
quently lost their footing over the slippery, steep slope, 
and rolled down, baggage and all, until they reached the 
bottom; or else they would sometimes stick half way 
339 
