It is a pleasure to send Dr. Hayden's monograph on its way to as yet unknown but hopefully widespread destinations with all the valedictions a Foreword may contain. Since I met the author in Cape Town in 1978 I have been struck, on numerous occasions, by the fortuitous combination of an inquisitive mind, a creative drive, a sharp awareness of the historical and social setting of phenomena, and a solid discipline which his personality displays behind a good-natured laugh. If a tree is known by its fruits, both Dr Hayden's PhD thesis and the present monograph afford quite an insight into the...