so that I was ill for several days.

The Rio Jangada, at an altitude of 1,550 ft., was 1,000 ft. lower than
the top of the plateau. The river flowed west into the Cuyaba River. We
crossed the stream, a rapid and foaming torrent. We soon began to climb
again on the opposite side over sweeping undulations. We waded through
two more streamlets flowing west--the second at an elevation of 1,650 ft.
We were travelling partly among campos on the summit of cones and domes,
partly through brush or scrub in the depressions. We struggled on, urging
the tired animals, rising gradually to 2,150 ft., then to 2,200 ft., over
soil strewn with volcanic pebbles and scoriae. During the night the
minimum temperature had been 53 deg. Fahr., but during the day the sun was
extremely hot and powerful, and animals and men were sweating freely. We
marched northward, then slightly to the north-west, leaving behind, to
the south-west of us, two quadrangular table-lands, rising above the
undulating line of a depression.

Shortly after, to the E.N.E., we perceived the section of an extinct
crater--the easterly point of its summit being in itself a semicircular
subsidiary crater. On one side of the greater crater was a conical
depression, at the bottom of which (elev. 2,400 ft.) was an extensive bed
of lava blocks of great size--hundreds of monolithic rocks standing up
like pillars. In fact, they stood all along the side of the crater as
well as inside it. Surrounding a pyramidal hill a group of those huge
pillars looked--to a casual observer--just like the ruins of a
tumble-down abbey.

Three hours' journey from our camp we reached the summit of a dome (elev.
2,500 ft.). Beyond it was a _cuvette_ with its typical central line of
_burity_ palms.

To the west we perceived a marvellous view of three immense dykes of red
rock--like walls--stretching from south-west to north-east; then two more
great perpendicular dykes of granite were disclosed close by.

Going over domes 2,550 ft. and 2,450 ft. above the sea level, we obtained
a vast and immense view of the _serradao_--wild country--before us, a
regular ocean of deep green undulations rising quite high to the south;
whereas to the north there extended a long plateau with a deep ravine on
its southern aspect.

We descended through scrub (elev. 2,400 ft.)--what the Brazilians call
_serradao_--and through a growth of stunted trees (elev. 2,450 ft.) to so
low an altitude as 2,300 ft. Going along a ro