ROCKY BARRIERS 
of the great domes displaying a sharp northern spur 
like the ram of a battleship. Next to it were three cylin¬ 
drical rocks, just like towers, one of which leant over the 
dome. 
Yet another rapid was shot through with no mis¬ 
adventure, and when we came to the end of a large island 
4,500 metres long and 80 metres wide, Priscilla Island, 
preceded by a smaller islet of sand and gravel, we arrived 
at a direct stretch of 4,000 metres of river, flowing to 
the west. Another rocky islet with an accumulation of 
sand and a lot of scattered rocks by its side, then a high 
island, were passed on our right, and farther on we found 
another great group of globular rocks at the point where 
Daphne Island, 350 metres in length, began. 
I hardly had time to map out the numberless rocks 
and islands we met before we came upon others. There 
again we saw three more islands in succession, Mars 
Island, 500 metres long and 100 metres wide; Jupiter 
Island, 250 metres long; and a third and smaller one, 
separated from the second by a channel strewn with huge 
boulders. 
To the north-northwest, at 340° bearings magnetic, 
we saw a hill 300 feet high, some distance from the stream. 
Innumerable rocks again occurred in the centre of the 
channel, and then we came to an extensive triangular 
island, Barretos Island, the base of which was 300 metres. 
Its left side was 2,000 metres long, its eastern or right 
side about 1,500 metres. A hill range some 300 feet high 
was looming before us to the northeast. The second 
island, Antonio Prado Island, had a total length of 2,000 
metres with an average width of 200 metres. 
On this magnificent island we halted at five o’clock 
in the afternoon, and I took altitude observations with the 
hypsometrical apparatus: 1,062 feet above the sea level. 
We were again lucky in fishing that evening. We 
caught six trahiras, several pacus , and two young jahus, 
109 
