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and Weed Problems. The 18th Symposium of the British Ecological Society, Bangor, 12-14 April 1976, 413 pages.

Keywords: the differences between more or less developed countries, the size of the difference, survivorship curves for live-borne babies, causes of the differences, poverty and climate, major causes of death in Nigerian children’s hospital, diarrhea, pneumonia, malnutrition, malaria, pertussis, measles, tuberculosis, smallpox, others, origins of the disease problems, epidemiological bases for the origin of disease problems, movement as a cause of disease outbreaks, genetic aspects of the origin of disease problems, the problems of almost successful control, effect on some diseases of poverty, outbreak problems and malaria eradication, side effects of attempts to raise living standards, development towards a cash economy, major water development projects, problems from attempted health improvements, misplaced ecological advice