448 NOTES OF A BOTANIST chap, xn 
curiara with two men, he reached a point where the 
river became impassable on account of rocky 
obstructions. A walk of two hours brought them 
to where it became one of several small rivulets 
with inclined rocky beds on a mountain slope, which 
may fairly be considered as the sources. of this great 
river. It still remains, however, for some com- 
petent observer to fix the position of the point 
reached. — Ed.] 
