ZIZYPHUS JUJUBE 
411 
from mere cracks in the ground. The larger come from 
definite pipes up to two or even three feet in diameter. From 
these the steam issues in a steady stream, too hot to hold 
one’s hand in, and with a slight blowing sound. There is no 
definite deposition of sulphur, silica, or any other mineral 
matter around the jets. 
Some of the jets are single, but most are in groups, lying 
along fault-lines running north and south, i.e. lines parallel 
to the main direction of the Eift Valley. 
In the accompanying photographs, No. 1 shows one of 
these fault lines, marked by a definite small escarpment, 
along which was a whole series of steam jets, three being visible 
in the picture. No. 2 is a nearer view of the centre jet of 
No. 1 ; on close inspection it was found that the steam was 
coming from several vents within a few yards of each other. 
The volcanic features of the district are highly interesting 
and would repay further study. There is a well-preserved 
cinder zone, some two or three hundred feet high, a few hundred 
yards north of the station, while the lava sheet covered by 
dense bush lying between it and Lake Elmenteita — 4 The 
Lava Forest ’ — provides a stretch of country some ten miles 
across, with worse walking and more difficulties of penetration 
than any of like size that I have ever been unfortunate enough 
to come across. 
Loose boulders and flakes of obsidian seem to carpet most 
of the Eburru district, and their effect on one’s boots is very 
destructive. 
ZIZYPHUS JUJUBE 
By C. W. Hobley 
All along the coast of British East Africa, particularly in 
the vicinity of settlements, there is commonly found a tree 
of irregular growth and usually having several stems. There 
appear to be two varieties, one with and the other without 
thorn ; the latter bears the bitter fruit. It has oval leaves, 
rough on the underside ; and the flowers, which are insignificant, 
