The substance is an oleo-resin, and when free from oil has a similar appearance to copal. Upon examination of the resin, it has been found to be dissimilar in properties from the various freshly exuded resins which enter the market under the name of recent or soft copal. (_Bulletin of the Imperial Institute_, vols. vi. [1908] and xiii. [1915].) The mode of collecting wood-oil is somewhat destructive, as, in order to procure an excessive flow, a hollow is scooped out in the main trunk and a fire is kindled in the hole thus made. The oil commences to flow rapidly after the fire is extinguished, which it is necessary that it should be before a large quantity of oil has exuded, on account of the inflammability of the latter. The application of fire to the trees does not appear to kill them, but they are rendered liable to attacks of noxious insects, and are often broken off by winds. In addition to the local use of the oil for maladies for which balsam of copaiba is generally employed, the rubber makers of Ilorin and Nupe add it to the latex of _Landolphia florida_ or _L. Thompsonii_ to make paste rubber. The two liquids are boiled together for some time, until the mixture attains a consistency of birdlime. The dried resin is here used for torches, and in the Egyptian Sudan for incense. =KOLA.=—Although a large quantity of kola nuts is annually imported from Lagos and the Gold Coast, such a great demand exists that the price of kola in Kano and Zaria is very high. The kola tree is seldom seen in any part of the country except on the west bank of the Kaduna river, where the famous plantations of the Emir of Bida are situated. The kola nuts produced from these plantations are said to be more appreciated than any other, and, in order that the variety might not be grown elsewhere, stringent measures are said to have been enforced by the Emir, and the nuts were always exported to the north, where it was impossible to grow the tree, and where a very remunerative price was obtainable. This particular kind of kola nut is referred to as “Laboji,” and is said to be white. The cultivation of kola could be undertaken in the Kabba and Bassa Provinces, especially in the moist valleys protected from severe winds by high plateaux, such as are commonly found in these localities. In the export table of 1907 a small quantity of kola is shown, but this probably represents the re-export of produce from the south. =COTTON SEED.=—The Lokoja Ginnery has exported a small quantity of cotton seed each year, but the trade is not a lucrative one, and the larger part of the cotton seed which is turned out of the ginnery is valueless for shipment. =FOOD CROPS.=—The products which have been referred to above are those which have hitherto been exported from the country, but by far the most important agricultural products are those upon which the population itself subsists, and in relation to which the exported products are merely in the position of a surplus.