634 
HOT SPKING. 
Chap. XXXI. 
there is another and still larger bed of coal exposed. Further 
up the Lofubu, there are other seams in the rivulets Inyavu and 
Makare; also several spots in the Maravi country have the coal 
cropping out. This has evidently been brought to the surface by 
volcanic action at a later period than the coal formation. 
I also went up the Zambesi and visited a hot spring called 
Nyamboronda, situated in the bed of a small rivulet named 
Nyaondoj which shows that igneous action is not yet extinct. 
We landed at a small rivulet called Mokorozi, then went a mile 
or two to the eastward, where we found a hot fountain at the 
bottom of a high hill. A little spring bubbles up on one side of 
the rivulet Nyaondo, and a great quantity of acrid steam rises up 
from the ground adjacent, about 12 feet square of which is so hot, 
that my companions could not stand on it with their bare feet. 
There are several Httle holes from which the water trickles, but 
the principal spring is in a hole a foot in diameter, and about the 
same in depth. Numbers of bubbles are constantly rising. The 
steam feels acrid in the throat, but is not inflammable, as it did 
not burn when I held a bunch of lighted grass over the bubbles. 
The mercury rises to 158° when the thermometer is put into the 
water in the hole, but after a few seconds it stands steadily at 160°. 
Even when flowing over the stones, the water is too hot for the 
hand. Little fish frequently leap out of the stream in the bed 
of which the fountaui rises, into the hot water, and get scalded to 
death. We saw a frog which had performed that experiment, and 
was now cooked. The stones over which the water flows are 
encrusted with a white salt, and the water has a saline taste. The 
ground has been dug out near the fountain by the natives, in 
order to extract the salt it contains. It is situated among rocks 
of syenitic porphyry in broad dykes, and gneiss tilted on edge, 
and having a strike to the N.E. There are many specimens 
of half-formed pumice, with greenstone and lava. Some of the 
sandstone strata are dislocated by a hornblende rock and by 
basalt; the sandstone nearest to the basalt being converted into 
quartz. 
The country around, as indeed all the district lying N. and 
N.W. of Tete, is hilly, and, the hills being covered with trees, the 
scenery is very picturesque. The soil of the valleys is very fruit¬ 
ful and well cultivated. There would not be much difficulty in 
