We first discussed the possibility of organizing a symposium on helminth communities in June, 1986. At that time, we were engaged in writing a joint paper on potential structuring mechanisms in helminth communities; we disagreed on a number of issues. We felt the reason for such debate was because the discipline was in a great state of flux, with many new concepts and approaches being introduced with increasing frequency. After consider able discussion about the need, scope and the inevitable limitations of such a symposium, we decided that the time was ripe to bring other ecologists, engaged in similar research, face-to-face. There were many individuals from whom to choose; we selected those who were actively publishing on helminth communities or those who had expertise in areas which we felt were particularly appropriate. We compiled a list of potential participants, contacted them and received unanimous support to organize such a symposium. Our intent was to cover several broad areas, fully recognizing that breadth negates depth (at least with a publisher's limitation on the number of pages). We felt it important to consider patterns amongst different kinds of hosts because this is where we had disagreed among ourselves."

Mit dem vorliegenden III. Band, in dem die chemisch-techni, >chen Untersuchungsmethoden der Erzeugnisse der organisch-chemischen GroB industrie behandelt werden, liegt das Erganzungswerk abgeschlossen vor. Der Inhalt hat gegeniiber dem des Hauptwerkes zum Tell eine starke Wandlung erfahren, bedingt durch die gewaltige Umwalzung und die bewunderungswiirdigen Erfolge in der Herstellung und Anwendung von organischen Stoffen als Werkstoffe und Faserstoffe. Bei diesen spielt fiir die Bewertung der Roh- und Fertigprodukte die Haltbarkeit und die mechanische Widerstandsfahigkeit eine ausschlaggebende Rolle, so daB deren Messung wertvollere und werkstoffgerechtere Ergebnisse liefert als die chemische Untersuchung allein. Aus diesem Grunde ist in den Abschnitten "Papier," "Gespinstfasern und Textilien," "Kunststoffe" und "Kautschuk und Gummiwaren" den physikalischen und mechani schen Untersuchungsmethoden ein viel breiterer Raum zugebilligt worden als bisher. Es ist so eine lehrreiche Dbersicht iiber die auf ver schiedenen Arbeitsgebieten gesondert entwickelten mechanisch-physikali schen Untersuchungsverfahren und MeBvorrichtungen zustande ge kommen. Bei den Anstrichmitteln ist dieselbe Entwicklung nach der Seite der starkeren Beachtung der Untersuchungen der Eigenschaften des fertigen Objektes zu verzeichnen, urn aus ihnen die Eignung des Mittels selbst zu kennzeichnen."

Reflecting the enormous advances made in the field over the past ten years, this text synthesizes the latest developments in the ecology and evolution of animal parasites against a backdrop of parallel advances in parasite systematics, biodiversity and life cycles. This second edition has been thoroughly revised to meet the needs of a new generation of parasitology students. Balancing traditional approaches in parasitology with modern studies in parasite ecology and evolution, the authors present basic ecological principles as a unifying framework to help students understand the complex phenomenon of parasitism. Richly illustrated with over 250 figures, the text is accompanied by case study boxes designed to help students appreciate the complexity and diversity of parasites and the scientists who study them. This unique approach, presented clearly and with a minimum of jargon and mathematical detail, encourages students from diverse backgrounds to think generally and conceptually about parasites and parasitism.

Professor Gerald W. Esch, one of the world's leading ecological parasitologists, presents a series of essays on classic examples of field parasitology. The essays focus on the significance of the work and its contribution to the field but also on the people and, particularly, the sites at which the work took place. Taken together, they represent a beautifully written account of the development of an entire field of scientific endeavor spanning a period of 50 years or more. While the essays are not meant to be academic in a scientific sense, they contain a great deal of science. The book will be of great value to all parasitologists and ecologists, but also to anyone interested in how biological field work is carried out and how it contributes to greater understanding of the natural world.

Reflecting the enormous advances made in the field over the past ten years, this text synthesizes the latest developments in the ecology and evolution of animal parasites against a backdrop of parallel advances in parasite systematics, biodiversity and life cycles. This second edition has been thoroughly revised to meet the needs of a new generation of parasitology students. Balancing traditional approaches in parasitology with modern studies in parasite ecology and evolution, the authors present basic ecological principles as a unifying framework to help students understand the complex phenomenon of parasitism. Richly illustrated with over 250 figures, the text is accompanied by case study boxes designed to help students appreciate the complexity and diversity of parasites and the scientists who study them. This unique approach, presented clearly and with a minimum of jargon and mathematical detail, encourages students from diverse backgrounds to think generally and conceptually about parasites and parasitism.