Illustrated With over 45 drawings and photographs.

The iris is a circular, pigmented tissue that separates the anterior chamber of the eye from the posterior chamber. It has a crucial role on controlling the amount of the light entering the eye through its central opening “the pupil". The Iris has multiple important functions that support and provide image clarity on the retina. However, it is a largely neglected part of the eye, compared to the cornea lens, retina, and optic nerve, and has not been focused on in a comprehensive way until now. The Iris: Understanding the Essentials, combines different aspects of scientific information from a variety of fields, such as anatomy, histopathology, molecular biology, electron microscopy and other diagnostic modalities. Each chapter will include pearls and summary points, and this multi-disciplinary approach helps the clinician diagnose and treat the large variety of diseases that affect the iris, with the main emphasize on pigmentary pathological changes that can affect the color of the eye. Written as a reference review book for universities, practicing ophthalmologists, Ophthalmology residents, pharmaceutical companies and diagnostic equipment manufacturing companies this book summarizes the information in an easy-to-use manner to help the reader better understand the iris, iris structure, physiology and function.

WINNER OF THE 2018 JOHN BURROUGHS MEDAL FOR OUTSTANDING NATURAL HISTORY WRITING “Both a love song to trees, an exploration of their biology, and a wonderfully philosophical analysis of their role they play in human history and in modern culture.” —Science Friday The author of Sounds Wild and Broken and the Pulitzer Prize finalist The Forest Unseen visits with nature’s most magnificent networkers — trees David Haskell has won acclaim for eloquent writing and deep engagement with the natural world. Now, he brings his powers of observation to the biological networks that surround all species, including humans. Haskell repeatedly visits a dozen trees, exploring connections with people, microbes, fungi, and other plants and animals. He takes us to trees in cities (from Manhattan to Jerusalem), forests (Amazonian, North American, and boreal) and areas on the front lines of environmental change (eroding coastlines, burned mountainsides, and war zones.) In each place he shows how human history, ecology, and well-being are intimately intertwined with the lives of trees. Scientific, lyrical, and contemplative, Haskell reveals the biological connections that underpin all life. In a world beset by barriers, he reminds us that life’s substance and beauty emerge from relationship and interdependence.

"Cultivation advice, information about the plants' breeding history, and ideas for using irises with other plants in the garden make this the perfect one-stop reference for iris enthusiasts everywhere."--BOOK JACKET.

Winner of the Nobel Prize in Literature Winner of the Pulitzer Prize From Pulitzer Prize-winning poet Louise Glück, a stunningly beautiful collection of poems that encompasses the natural, human, and spiritual realms Bound together by the universal themes of time and mortality and with clarity and sureness of craft, Louise Glück's poetry questions, explores, and finally celebrates the ordeal of being alive.

Divine Variations offers a new account of the development of scientific ideas about race. Focusing on the production of scientific knowledge over the last three centuries, Terence Keel uncovers the persistent links between pre-modern Christian thought and contemporary scientific perceptions of human difference. He argues that, instead of a rupture between religion and modern biology on the question of human origins, modern scientific theories of race are, in fact, an extension of Christian intellectual history. Keel's study draws on ancient and early modern theological texts and biblical commentaries, works in Christian natural philosophy, seminal studies in ethnology and early social science, debates within twentieth-century public health research, and recent genetic analysis of population differences and ancient human DNA. From these sources, Keel demonstrates that Christian ideas about creation, ancestry, and universalism helped form the basis of modern scientific accounts of human diversity—despite the ostensible shift in modern biology towards scientific naturalism, objectivity, and value neutrality. By showing the connections between Christian thought and scientific racial thinking, this book calls into question the notion that science and religion are mutually exclusive intellectual domains and proposes that the advance of modern science did not follow a linear process of secularization.

The diversity of bearded irises rivals that of any other perennial grown in temperate climates. For some gardeners, they bring back warm memories of a grandparent's garden; for others, they're a cutting-edge plant with a seemingly endless capacity for producing new forms and patterns. As the manager of Rainbow Iris Farm and co-editor of the Bulletin of the American Iris Society, Kelly Norris is the authority on gardening with bearded irises. His introductory chapters offer tips for successful growth, garden design, plant selection, and "creating" new irises. A Guide to Bearded Irises also provides portraits of the most outstanding plants in each of the six recognized categories, from the dainty miniature dwarf bearded irises to the stately tall bearded irises. A resource section lists specialty nurseries, organizations devoted to bearded irises, and public gardens with notable iris collections.