| To Dr F. Sinclair for his talented and inspired teaching. Dr. G. Edwards-Jones for his commitment to education and to conservation, which is also inspiring. | To Meryl for her friendship, poise, and help. To Dr. Colin Price for his excellent lectures and teaching methods, support and, sense of fun. | To Dr. G. George for his enthusiastic help. To Dr H. Omed for his support and kindness at all times. | To Suzanna for her care. To Suzanna’s parents for their good wishes. | To my daughter for her bright merriness. To my mother for her interest and support. To Matt for his engaging conversations. To the Q people. | To all the fine people on my course. To those people who made me feel at home.