6 FRIEDRICH WELWITSCH. 
ing the district in every direction, crossing the singular range 
Pedras de Guinga, the banks of the Lombe and the Cuige, and pen 
trating as far as the charming islands of Calemba, in the Cuanza, sad 
the immense eg sion stretch from Quisonde to — near the 
cataracts of the ri uanza. This point, about 250 m the 
coast, was the farthest to the east which was reached. On his way 
back to Pungo-Andongo, Dr. Welwitsch visited the salt-lakes of 
Quitage and the magnificent forests on the right banks of the Cuanza, 
and during a short stay at ae em explored the woods beyond 
the Rio Luxillo, and in the direction of Cambambe. After this he 
returned to ae old station of Golumgo-Alto, intending to explore the 
banks of io Lucala and region of Duque de Braganga to the 
eastwards ; eu on the first night of the expedition, he was deserted 
by half his men, and the remainder refused to advance. ‘To his 
great regret he was therefore obliged to abandon the enterprise, and 
return to Sange, where he devoted several weeks to the arrangement 
of his collections. Thence he travelled back to Loanda, reachi 
it in August, 1857, having completed three years of unaided explo- 
tions. 
“Pee time the territory explored by Dr. Welwitsch com- 
prised a triangle, of which the base, of about 120 geographical miles, 
er the coast, whilst the apex was the point already mentioned . 
at ree on the right bank of the Cuanza. i 
forced inaction at Loanda, he corresponded with botanists,* 
ol (in J June, 1858) drew up a valuable ae of a sete in the 
form of a Mappa Phyto-geographica, a of his 
botanical collections. This was published a Sia sills the title 
Angola na Africa Equinocial,” in the ‘‘Annaes do Conselho Ultra- 
marino”? for December, 1858. From this paper of sixty-six closely 
printed pages, we learn that he had, during his three years of travel, 
collected and arranged 3227 species of plants (to which 510 were 
afte: 
whole number of species collected, followed, in columns, by the’ 
number in each of the three regions, lito ral, montane, and high table- 
on the distribution and most characteristic nana found. Many new 
species are first mentioned or described in the appendix which con- 
cl i eatise. 
Successful as had been the scientific results of these travels, erst 
had been attained only at the price of shattered health, and rest w 
absolutely necessary. A short trip to the district of Libongo, ih 
of Loanda, was the only journey made till June, 1859, when his 
health having been somewhat restored, though still suffering from 
fever, Dr. Welwitsch recommenced his explorations in fate 
direction. His intention was to investigate the littoral region of 
Benguela and Mossamedes only, but his travels, fortunately for 
science, extended over a greater extent of co ountry. After a short 
* Two valuable letters on the vegetation of Angola, addressed to Mr 
W. W. Saunders, are printed in the Linn. Society’s Jo urnal, vol, iii., p. 150. 
