A scheme for draining the great level of the fens, called bedford-level : And for improving the navigation of Lyn-Regis. Founded upon self-evident principles in experintental philosophy and practical mathematicks, and upon historical facts. And farther demonstrated, by comparing the River Ouse, with the River Thomas, &c. and Lyn-Harbour, with the Harbour of Rye. With reflections upon all the schemes hitherto proposed for draining the fens, shewing wherein they are defective. Also observations upon artificial-scours: shewing where, and in what cases they are, or can be of use; where not. Illustrated with a map. By Tho. Badeslade, author of The history of Lyn-navigation, and of draining in the fens.