Book reviews : Tyson,P.D. 1986: Climatic change and variabil ity in southern Africa. Oxford: Oxford Univer sity Press. ix + 220 pp. £20.00 cloth

Pittock, A.B. , Frakes, L.A. , Jenssen, D. , Peterson, J.A. and Zillman, J.W. 1978: Climatic change and variability - a Southern Hemisphere perspective. Cambridge: Cambridge University Press.