A single day: July 4, 1863, brought to a conclusion two of the most infamous battles of the Civil War. This book tells the story of these two pivotal battles.

Attendant upon the existence of numerous and varied ingenious methods for taking fish and the prevalence of many dialects in the Republic of the Philippines is the confusion that results from the use of the diverse vernacular names of fishing appliances. This has hampered an understanding of the Philippine fisheries, and it is foreseeable that it would increase the problems that arise in attempts ot manage fishery resources on a national scale.

The tide is the greatest synchronised movement of matter on our planet. Every drop of seawater takes part in tidal motion, driven by the gravitational pull of the moon and sun. At the coast, we see the tide as a twice-daily rise and fall of sea level that moves the edge of the sea up and down a beach or cliff-face. In some places, the tide is small but at others it can rise in a few hours by the height of a three storey building; it then has to be treated with great respect by those who live and work by the sea. In this Very Short Introduction David George Bowers and Emyr Martyn Roberts explore what we know about the tides. Blending clear explanations of well known tidal phenomena with recent insights in the deep ocean and coastal seas, Bowers and Roberts use examples from around the world, to tell the story of the tide, considering its nature and causes, its observation and prediction, and unusual tides and their relevance. They explore why tides have attracted the attention of some of the world's greatest scientists, from the initial challenge of explaining why there are two tides a day when the moon and sun pass overhead just once; a problem that was solved by Isaac Newton. In the 19th century, scientists unravelled the rhythms of the tide; good tidal predictions in the form of tide tables were then possible. The predictions were made on beautiful tide predicting machines constructed of brass and mahogany, some of which can still be seen in maritime museums. In the 20th century, the importance of tides as mixers of sea water became evident. As Bowers and Roberts explore, tidal mixing of the ocean is essential for maintaining its deep circulation, a key part of the climate-control system of our planet. In inshore waters, tidal mixing enhances biological productivity, influences sea temperature and turbidity and creates dramatic features such as maelstroms and tidal bores. In the 21st century, space probes are examining the effects of tidal processes on the moons of Jupiter and Saturn and the possibility of tidally-heated liquid oceans with their own ecosystems. Looking to the cutting edge of tidal research, Bowers and Roberts also consider how we can study the role of the tide in the geological and biological evolution of our own planet with innovative computer models. ABOUT THE SERIES: The Very Short Introductions series from Oxford University Press contains hundreds of titles in almost every subject area. These pocket-sized books are the perfect way to get ahead in a new subject quickly. Our expert authors combine facts, analysis, perspective, new ideas, and enthusiasm to make interesting and challenging topics highly readable.

The Migration Age is still envisioned as an onrush of expansionary "Germans" pouring unwanted into the Roman Empire and subjecting it to pressures so great that its western parts collapsed under the weight. Further developing the themes set forth in his classic Barbarians and Romans, Walter Goffart dismantles this grand narrative, shaking the barbarians of late antiquity out of this "Germanic" setting and reimagining the role of foreigners in the Later Roman Empire. The Empire was not swamped by a migratory Germanic flood for the simple reason that there was no single ancient Germanic civilization to be transplanted onto ex-Roman soil. Since the sixteenth century, the belief that purposeful Germans existed in parallel with the Romans has been a fixed point in European history. Goffart uncovers the origins of this historical untruth and argues that any projection of a modern Germany out of an ancient one is illusory. Rather, the multiplicity of northern peoples once living on the edges of the Empire participated with the Romans in the larger stirrings of late antiquity. Most relevant among these was the long militarization that gripped late Roman society concurrently with its Christianization. If the fragmented foreign peoples with which the Empire dealt gave Rome an advantage in maintaining its ascendancy, the readiness to admit military talents of any social origin to positions of leadership opened the door of imperial service to immigrants from beyond its frontiers. Many barbarians were settled in the provinces without dislodging the Roman residents or destabilizing landownership; some were even incorporated into the ruling families of the Empire. The outcome of this process, Goffart argues, was a society headed by elites of soldiers and Christian clergy—one we have come to call medieval.