106 
erable valuable led was lost, all of the remainder being 
water soaked and more or less damaged. 
he Bopi River runs ee high mountains, syed ear 
of ascent. The bad rapids begin when one is about two-thirds 
and the river bed is filled with huge ae which make the entire 
journey decidedly dangerous. The men who navigate the rafts 
are Indians, called balseros, and they are ee lly strong and 
i i At s 
no more profitable way of spending a season than for a party to 
properly equipped for iia upon themselves and a eee 
systematically in this regio: 
The conditions of ene along this river vary greatly at 
different points and this variation is of the greatest interest. 
but these collections cannot be characteristic, because they had 
to be made near the stream, where the full effects of the aridity 
did not manifest rhemselves. It is to be noted that even in the 
