M ascarenhasia clastica known in th ‘ trade as .Mgoa rubber, is 
only found south of Dar-es-Salaam. 
Several trials have been made with other kinds of rubber. Hevea 
Brash 'iensis (Para rubber) has been planted repeatedly, but with- 
out success, the climate being too dry. Ficus elastic a, L. Madagas- 
car iensis, and an Euphorbia sp. ( from Madagascar) have done 
fairly well. Castilloa elastica , Hancornia speciosa , and Wi Hough - 
beta, were each tried once, but the seed did not germinate. Mam- 
hot Glaziovii (Ceara rubber) was first planted at Tanga in 1891. 
There are at present about 20,000 trees, but it is feared that it will 
not pay as the atmosphere is too moist. 
It is thought probable that Ceara rubber will do better in Donde 
Barikiwa (Kilwa district), where a small experimental plantation 
has lately been opened. 
The Decree which came into force on January 1st, 1898, forbid- 
bing the export of impure rubber, was altered on June 7, 1900. 
Such rubber, when met with, is to be confiscated by the authorities, 
from whom it may be purchased by responsible European mer- 
chants, who bind themselves not to sell the ^ame as rubber of good 
quality. 
Gutta-percha. — The Calolropis proccya, shrub, which is often 
met with in the plains, is said to yield guttapercha of good quality, 
Copra. — Several thousand Coco-nuts have been planted during 
the year under review by the German Government. 
It is estimated there are over 1,500,000 palms in the colony. 
The export of copra has increased considerably during the last 10 
years. 
GUDl arabic. — Gum arable, the concrete juice which exudes 
from the commonest of all the acacia trees of the East African 
steppes (Acacia Senegal ), is likely to form an important article of 
export in the near future. 
Tanning plants. — The Acacia Catechu, the bark of which is 
exported in large quantities from India and Burmah, grows wild in 
most parts of the colony. Other trees which occur frequently in 
German East Africa, and which are much used elsewhere for tan- 
ning purposes, are Acacia Arabica, Pterocarpus erinaceus, and the 
mangrove. 
Colouring plants. — Although plants containing colouring mat- 
ter are now a days of little value, yet an examination is at present 
being made of the wild Indigofera, of the yellow wood of the 
Cardiogyne Africana, of the yellow bark of the Ochna alboserrata 
and the Zanthoxylon, of the red-coloured Randeia malleifera, and 
of the purple Cassia goratensis. 
Thousands of beautifully coloured hand-made mats of plaited 
straw are exported yearly to Zanzibar, Arabia, and India. The 
(Note. — J \t ascarenhasia elastica has been introduced into the Gardens in Singapore, 
and seems to grow remarkably well, We want to know more about the value cf its 
rubber. The statement as to Calotropis procera producing gv.tta percha is an error, 
It only produces a very inferior rubber, Ed.) 
