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This textbook introduces the basic concepts of mathematical modelling when applied to natural systems. It focuses on tackling real-world problems from a variety of fields including physics, ecology, geology and epidemiology.

At present, most books on ecological modelling rely on very complex mathematics, resulting in students and researchers shying away from investigating the potential uses of ecological models and their methods of construction. This new book aims to open up this exciting area to a much wider audience. Assuming only basic mathematical knowledge, the text uses case studies to show how a relatively small set of techniques of model construction can be used in a wide range of important applications. Researchers will find it an invaluable guide to using ecological models in their work.

At present, most books on ecological modelling rely on very complex mathematics, resulting in students and researchers shying away from investigating ...

Rolfe Humphries (18941969), in addition to being an outstanding poet, left an impressive trail as a translator, teacher, critic, and editor. But, as Richard Gillman maintains in his introduction, poetry was the driving force behind these other special skills and interests. Humphries was, Gillman writes, an example of "the total poet. . . . If ever there were poets who did in fact breathe their art, he was one of them."

These letters for the first time illumine Humphries and his achievements. We see him as the mentor to younger poets, including Theodore Roethke, providing rare glimpses of...