270. The West African Culture-area and Its Meaning
Over the larger northern portion of the Congo drainage and along the Guinea coast from the Niger mouth to the Senegal, there prevails a well defined West African culture. This is marked by a number of traits which within Africa are approximately confined to it. These traits include the cultivation of the banana but general absence of millet and cattle; gabled houses of thatch, other Africans building domed or conical structures or mud dwellings; clothing of palm fiber or bark; straight self-bows with pointed ends and encircling ridges for the attachment of the looped cord of rattan; shields of wood or cane, in place of which other Africans employ leather bucklers, shields of hide, or parrying sticks; face masks for religious purposes; carvings of the human form; slit wooden drums; xylophones; and a number of other traits.
Two interpretations can be suggested for this consistent and geographically limited association of traits. One makes use of the recurrence of many of the elements in the Indo-Oceanic and especially the Melanesian area. As the latter is also Negroid territory, an ancient connection is conceivable. This would obviously have to be old enough to precede the Egyptian, west Asiatic, and Indian-East African culture developments. These later growths would be interpreted as having spread less far, although obliterating the antecedent Negroid culture so far as they did diffuse. This explanation fits well with the principle that, other things equal, superposed culture strata appear centrally, underlying ones survive marginally. Proof, however, must depend on whether the parallel traits are really specifically similar, whether they constitute a reasonably large proportion of the culture of the two areas, and whether they are lacking in the intervening region. This evidence is naturally difficult to assemble.
The other interpretation is less incisive. It looks upon the resemblances as at least partly conditioned by environment; and would tend to explain the remainder as due to a diffusion, early indeed, but gradual and applying to single elements or small clusters of traits rather than to an association of traits large enough to form a culture and moving as a single block. In this connection it is significant that the Oceanic area is one of tropical forest, and the West African area the only large forested tract in its continent. Hence the absence of cattle and open-country grains, the use made of the banana. Hence too the possibility of bark cloth; and the extremely serviceable rattan cord, which in turn may have demanded a certain type of bow; whereas other types, like the sinew-backed bow, would be unsatisfactory in the humid climate. And the carving of wood, while not due to the forest, was at least made possible by it. In short, diffusion may have been the motive power involved, but like environmental conditions in the two areas caught and helped to preserve such elements as were diffused—stabilized the culture once it was adapted to the soil and rendered it more resistive to importations of traits worked out in different climates. This interpretation at any rate makes smaller assumptions than its competitor, and serves as an illustration of the need of environmental conditions being kept in mind in the explanation of culture, even though the essential explanation be in social or cultural terms.