9d 37' 46" S., long.

16d 59' E.) we expected to get a little seed-wheat, but this was not now to be found in Angola.

The underlying rock of the whole of this section is that same sandstone which we have before noticed, but it gradually becomes finer in the grain, with the addition of a little mica, the farther we go eastward; we enter upon clay shale at Tala Mungongo (lat.

9d 42' 37" S., long.

17d 27' E.), and find it dipping a little to the west.