100 
especially in Sigital, one may advise, for those praising on 
which irrigation is possible, that Hevea should be planted between 
the Manihot. If the experiment should succeed, the large gains 
from Hevea-rubber would more than compensate for the loss of the 
Manihot, which would probably be killed off by overshadowing. 
“The plantations of rubber-lianes in the Neulangenburg diettict 
on Lake Nyassa are also interesting, and appear to be doing quite 
well. These lianes may be recommended for planting as a sub- 
sidiary culture. The species most generally planted here is 
Landolphia Stolzii, a robust liane, which develops well even on dry 
soil, and in ten years attains a height of 15-20 m. with a stem 
20 cm. in circumference. According to Dr. Eduardoff one can now 
reckon on obtaining 75 grm. of eood rubber by tapping once in zig- 
zag fashion, and this can be done once a month, periods of rest being 
naturally allowed. In this species young plants give bad rubber, 
and therefore tapping does not appear to be advisable before the 
seventh year. The cultivation of the shrubby Landolphia dondeensis 
has also been started, and is perhaps locally promising. 
* All the other rubber-plants in East Africa are still in the 
experimental stage. mong these are Cryptostegia grandiflora, 
Clitandra hilimandjarica, Mascarenhasia elastica, which does not 
appear to thrive, and Ficus Schlechieri, a tree, which, after yal 
years ee cultivation, is only now beginning to increase its rate o 
growt 
VIII—THE JAPANESE SPECIES OF CERASTIUM. 
H. TaKepa. 
Historical. 
Thunberg* was the first botanist to record the J apanese species 
the present genus. He enumerates two species, viz. :—C. vulgatum 
C. viscosum, According to Miquelt these two plants of Phushers 
a not differ from each other but are C. vulgatum, Linn. a brachy- 
petalum lusus glandulosum, Fenzl. In 1875 Franchet and Savatiert 
Pecan published in 1879 made some alterations and saiditions 
to their previous knowledge. They considered that the specimen, 
no. 137, collected by Savatier at Yokosuka and referred to in their 
work ander C. glutinosum must be C. vulgaium var. glandulosum, 
apon. 
Franchet oe Saeiillaes Enum. Pl. Japon, nto . 50 ( 
EE owiez, in Bull. Acad. Imp. St. Pe aaake pony Xviii. pp. 385-386 
