ATT 
to London (Rep. Dept. Agric. Barbados, 1909—10, p. 15); value 
here retail about 4s.—5s. for 28 lb. or about 18s. 6d. a barrel. They 
fetch about the same price (2d. to 3d.) per Ib. retail in Paris, 
shipped from Algiers, where a remunerative price to the farmers 
is put at about įd. per lb. or 50 francs a ton (Cons. Rep. Ann. No. 
5206, 1914, p. 11). The local value in the Province of Bassa, 
Northern Nigeria, is 1d. per 10 Ib. (Byng-Hall, N. Nig. Gaz. 30th 
June, 1913, p. 241), and approximately the same (-16d. per 1b.) in 
Kontagora (Clarke, N. Nig. Gaz. l.c. p. 243, “ Dankali’’). The 
cost of production in Nigeria does not appear to have been recorded, 
but in all countries this would vary greatly. In the United States 
the approximate cost (exclusive of rent and fertilisers) of growing 
and harvesting an acre of sweet potatoes is estimated at 20 dollars 
p 
(Duggar, U.S. Dept. Agric. Farmers’ Bull. No. 26, 1897, p. 29). 
from about 5000 to 20,000 Ib. per acre. The yield in the Bassa 
Province, N. Nigeria, is given at 1650 lb. per acre (Byng-Hall, 
l.c.) and in Kontagora as 61 masuka of 38 lb. each=2318 Ib. 
) 
Specially large yields per acre have been obtained in Louisiana 
from the varieties ** Providence ’’—1072 bushels, ** Shanghai "— 
758, ‘ Red Nansemond ’’—717, * Peabody *’—696, ‘ Norton "— 
654, * Hayman "—651, “ Southern Queen "— 640, ** Georgia " — 
T 
does "—531, ** Negro Choker ’’—534, and “‘ Spanish Yam. 77000 
bushels (Duggar, U.S. Dept. Agric. Farmers' Bull. No. 26, 1897, 
p- 20). 
Yoruba-land it is grown in rotation with maize, yams, beans, etc. 
243). n B.E. Africa the natives of 
resulis, the plants being grown from cuttings and covering the 
ground in about two months’ time (Col. Rep. Ann. No. 519, 
There are upwards of 50 varieties of the plant under cultiva- 
iion, distinguished by the deeply lobed, slightly lobed, or 
+ 
