_Landolphia florida_, Benth., is common in places similar to those where the last-mentioned vine occurs, but the latex is not used in any way to adulterate the good rubber, nor is inferior “paste” rubber made from it, as in other places in West Africa. _Ficus Vogelii_, known as “Kobbo” (Mandingo), has recently been used for extracting an inferior rubber, which has been shipped in small quantities. This tree is found growing in Bathurst as well as in many of the large towns, where it often attains a large size, and affords an excellent shade for native markets, etc. A view of a tree in Bathurst is shown (Fig. 3). Information regarding the composition and value of the rubber of _Ficus Vogelii_ is given in the _Bulletin of the Imperial Institute_, vol. vii. (1909), p. 260. Some of the South American species of rubber trees have been planted at different places, but for the most part the climatic conditions have proved unsuitable for their establishment. An exception to this is the Ceara rubber (_Manihot Glaziovii_), large trees of which were to be seen in Bathurst and at Bakau, but in the latter locality appear to have been cut down during recent years. It is generally acknowledged that Ceara rubber has not proved successful in plantations made in different parts of West Africa, for, although rubber of the finest quality can be easily prepared from the latex, the tree furnishes an extremely inconstant yield of latex. In the Gambia the tree reproduces readily, and, as far as can be judged, produces a latex capable of being coagulated into good rubber. As a shade tree it is recommended to be grown along public roads, and it might prove expedient in the country to make small experimental plantations, in the manner adopted in Togoland and elsewhere. By this system, tapping is continued for a few years, and whole blocks of trees are cut out as they cease to yield latex—the seedlings which have sprung up beneath these trees being permitted to take the place of the original trees. An illustration showing a Ceara rubber tree at Bakau is given (Fig. 5). One specimen of _Castilloa elastica_, of which a photograph is given (Fig. 6), is growing in the Kotoo farm, about 12 miles from Bathurst. This tree has not, so far, proved successful in West Africa, and the example photographed is apparently in better condition than those grown in the Botanic Gardens of the Gold Coast and Southern Nigeria. _Funtumia elastica_, the Lagos silk rubber tree, does not thrive in the Gambia, and the rainfall has been found to be insufficiently distributed for the cultivation of the Para rubber tree (_Hevea brasiliensis_). The observed facts point to the conclusion that further experimental trials of certain species of rubber trees in the Gambia should be made.