A window provides access to two of life's essentials, light and air, but it is more than just a means to an end. Windows also have symbolic, expressive and architectural qualities that have for centuries inspired some of the world's greatest artists. In this engaging new study, Christopher Masters celebrates the multiple roles of the window in art through five key themes, from the window as a status symbol to its use as a provider of physical and spiritual illumination; from its employment as a literal window on the world outside the confines of a room to its function as a mirror, reflecting...

Soluble catalysts are used extensively in many branches of chemistry and are indeed a vital constituent of many natural processes. They find wide application throughout the chemical industry where they assist in the production of several million tonnes of chemicals each year. Since homogeneous systems, especially those incorporating transition metals, often function effectively under milder conditions than their heterogeneous counterparts, they are becoming increasingly important at a time when the chemical industry in particular, and society in general, is seeking ways of conserving energy...