In addition to the three kinds referred to, all of which are grown as field crops, single plants of a fourth are sometimes seen near villages, especially in the Bassa Province. This is the crimson-flowered tree-cotton identified as _Gossypium arboreum_, var. _sanguineum_, and is nowhere cultivated upon a large scale. The lint is silky and fine, and the seed is covered with green fuzz. =Exotic Cottons.=—American and Egyptian seed have been introduced in many localities, especially in the Provinces of the Niger valley. Cotton grown from American Upland seed in Bassa Province has been well reported upon, but the deterioration of the quality of seed reproduced by this kind has proved a serious drawback to establishment. It is generally acknowledged that the indigenous cottons are hardier and more prolific than the introduced varieties, and are better able to withstand the attacks of the local insect pests. It is probable that the climate of the Northern Provinces will be found more suitable for the cultivation of American Upland cottons, as the indigenous plant of that region more nearly approximates the latter type. =Valuation of Cottons.=—The following table shows the value of different cottons grown in Northern Nigeria and examined at the Imperial Institute. (See Professor Dunstan’s “British Cotton Cultivation,” pp. 34-37.) Locality. Kind. Length of Staple. Value. Standard value at time of test. Bassa American ·9-1·2 in. 7½_d_. M.A. 6·39_d_. „ „ 1-1·3 „ 5½-6_d_. „ „ „ 1-1·3 „ 6¼_d_. „ „ „ ·8-1·2 „ 6¼_d_. „ „ „ 1-1·3 „ 6¼_d_. „ „ „ ·9-1·4 „ 6_d_. „ „ „ ·9-1·3 „ 6_d_. „ „ „ ·9-1·2 „ 6-6¼_d_. „ „ „ 1·-1·3 „ 6¼_d_. „ „ Native ·9-1·3 „ 6½-7_d_. „ „ „ 1-1·4 „ 8½-9_d_. M.R.P. 9·1_d_. „ „ 1-1·3 „ 8_d_. „ „ „ ·9-1·4 „ 8¼-8½_d_. „ „ „ ·8-1·2 „ 7¾-8_d_. „ „ „ 1-1·3 „ 8¼_d_. „ „ „ 1·2-1·5 „ 8¼_d_. „ „ „ 1-1·3 „ 8_d_. „ „ „ ·9-1·3 „ 8½_d_. „ „ „ 1·1-1·6 „ 8-8½_d_. „ „ „ ·9-1·3 „ 6_d_. M.A. 6·39_d_. Zaria Brazilian (?) ·9-1·2 „ 4_d_. „ „ Egyptian ·9-1·5 „ 6_d_. F.G.F.B. 10¹⁄₁₆_d_. Yola Native ·8-1·2 „ 4½_d_. M.A. 6·39_d_. „ American ·9-1·3 „ 6¼_d_. „