EFFBOT OF EAINB. 
351 
with trees. We crossed the river Naekachinta, flowing 
westward into tho Kafuc, and then passod over ridges of 
rocks of tho same mica schist which wo found so abundant 
In Golungo Alto : hero they wcro surmounted by reddish 
porphyiy and finely-laminated foldspatkic grit with trap. 
As we passed along, tho pcoplo continued to supply us 
with food in groat abundance. They had by somo moans 
or other got a knowledge that I carried medicine, and, 
somewhat to tho disgust of my men, who wished to koep 
‘t all to themselves, brought their sick children for euro. 
Some of them I found had hooping-cough, which io ono of 
the few opidomies that range through this country. 
CHAPTER XXVIIi. 
DR. LIVING 8T0NE DESCENDS THE ZAMBESI RIVER Tt ITS CON- 
FLUENCE WITH THE LOANGWA. 
13<A. — The country is becoming very beautiful, and fur- 
rowed by deep valleys; tho underlying rocks, being igneous, 
havo yielded fertile soil. Thero is great abundance of largo 
game. Tho buffaloes select open sjiots, and often eminences, 
as standing-places through tho day. Wo crossed tho Mbai, 
and found in its bed rocks of pink marblo. Somo little 
hills near it aro capped by marble of beautiful whitonoss, 
tho underlying r^ck being igneous. Violent showers occur 
frequently on tho nills, and cause such sudden sweeping floods 
in those rivulots that fivo of our men, who had gone to the 
other sido for firewood, wcro obliged to swim back. The 
temperature of tho air is lowered considerably by the daily 
rains. Several times tho thormomotcr at sunriso has boon 
as low as 68°, and 74° at sunset. Generally, however, it 
stood at from 72° to 74° at sunrise, 90° to 96° at mid-day, and 
