Yams (Ignames).—Of these there are several
kinds, the white, or “floury”; the Guinea; the hard;
the yellow, or “affoo”; the negro; the Japanese;
and the Indian yam. The white yam is generally
considered the best. These tubers are in appearance
something between Jerusalem artichokes and potatoes,
particularly the sweet potato or batata, which they
greatly resemble, though actually belonging to
different species. They can, however, be cooked
in the same way.