We live in a world of measurements. Measurements, be they of length, speed, weight, temperature, intelligence, income, endurance, greed, gross domestic product, quality of life, unemployment or skill at a job, are all numerical manifestations of the extent of some underlying attribute. They reflect the reality around us – length and weight provide examples of systems that represent clear physical attributes. At the same time, measurements also define the reality around us – psychometric tests and price inflation constitute both the definitions and the procedures for measuring these concepts. Altogether, measurements are central to our modern world and our view of it. This book explores the nature of measurement, investigating its different kinds, how these kinds should be interpreted, and the legitimacy of their statistical manipulation. The procedures through which numbers are assigned to objects are described, and measurement in psychology, medicine, the physical sciences, and the social sciences are examined in detail. The ideas of measurement are so ubiquitous that we often fail to notice them; they are concealed behind a veil of familiarity. This book lifts the corner of that veil and, in doing so, shows that there are aspects of the familiar world that are occasionally puzzling, sometimes downright extraordinary, and often more intriguing than is generally believed.

Famous for their size and elegance in flight, albatrosses are familiar to anyone who has travelled through the southern oceans, and are a flagship family of conservation concern. However, albatrosses are just one of several groups of 'pelagic' birds - those that visit land only to breed, and spend the rest of their lives far from the coast, soaring from ocean to ocean in a never-ending search for food. Mysterious and graceful, these birds can present a formidable identification challenge to even the most experienced birder. This fixed-format ebook provides the answer - the first comprehensive guide to pelagic birds, the albatrosses, petrels, shearwaters, storm-petrels and diving petrels. Optimised for iPad, it features the book in crisp, clear high-resolution. A total of 46 detailed, fully zoomable colour plates highlight key ID criteria of the birds in flight, with close-ups of diagnostic regions of the plumage. The plates are accompanied by accurate distribution maps, while the sparkling text brings the world of these amazing birds to life. Sea-watchers all around the world will find this superb field guide indispensable – and no birder will want to be without it.

The fifth order of the natural kingdom is made up of an estimated 1.5 million species of fungi, found in every habitat type worldwide. The Book of Fungi takes 600 of the most remarkable fleshy fungi from around the world and reproduces each at its actual size, in full colour, and accompanied by a scientific explanation of its distribution, habitat, association, abundance, growth form, spore colour and edibility. Location maps give at-a-glance indications of each species known global distribution, and specially commissioned engravings show different fruitbody forms and provide the vital statistics of height and diameter. Theres a place, too, for readers to discover the more bizarre habits of fungi from the predator that hunts its prey with lassos to the one that entices sows by releasing the pheromones of a wild boar. Mushrooms, morels, puffballs, toadstools, truffles, chanterelles fungi from habitats spanning the poles and the tropics, from the highest mountains to our own gardens are all on display in this definitive work.

For millennia, humans have regarded snakes with an exceptional combination of fascination and revulsion. Some people recoil in fear at the very suggestion of these creatures, while others happily keep them as pets. Snakes can convey both beauty and menace in a single tongue flick and so these creatures have held a special place in our cultures. Yet, for as many meanings that we attribute to snakes—from fertility and birth to sin and death—the real-life species represent an even wider array of wonders. The Book of Snakes presents 600 species of snakes from around the world, covering nearly one in six of all snake species. It will bring greater understanding of a group of reptiles that have existed for more than 160 million years, and that now inhabit every continent except Antarctica, as well as two of the great oceans. This volume pairs spectacular photos with easy-to-digest text. It is the first book on these creatures that combines a broad, worldwide sample with full-color, life-size accounts. Entries include close-ups of the snake’s head and a section of the snake at actual size. The detailed images allow readers to examine the intricate scale patterns and rainbow of colors as well as special features like a cobra’s hood or a rattlesnake’s rattle. The text is written for laypeople and includes a glossary of frequently used terms. Herpetologists and herpetoculturists alike will delight in this collection, and even those with a more cautious stance on snakes will find themselves drawn in by the wild diversity of the suborder Serpentes.