Once the basic idea of hypertext had spread rapidly throughout the world via the Internet, the reception of hypertexts soon became subject of empirical research among psychologists, cognitive scientists, and educational researchers. As easy to use software for the writing of hypertexts (HTML editors) is now broadly available, there are no longer any technical obstacles for the use of hypertext production in teaching and learning. This book presents and analyses the learning effects that can be anticipated from the production of hypertexts. It includes laboratory experiments, studies on the production of hypertexts in the context of educational institutions, and reports on software environments designed for the production of hypertext. It includes theoretical, empirically and developmentally oriented contributions. The first three chapters link up directly with research on traditional writing while addressing aspects of the interaction between content and rhetoric during hypertext writing. The next three chapters focus on cooperative learning of students in and through the production of hypertexts. The following two chapters look at new technological possibilities, namely, a software environment for transforming textbooks into personalized hypertexts and the design of hypervideos. The final chapter discusses potential methods for further research.

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During the past decade, the prognosis of bone and soft tissue tumors has improved considerably. This progress has not only been due to improved therapeutics and diagnostic methods but also due to a team approach now universally adopted. Comparison of results, possible today, were hampered in the past by lack of a clinically relevant staging system and definitive treatment proto cols. The complexity of the therapeutic management of bone tumors re quires a constant exposure to tumors, highly skilled diagnostic tech niques, and specialized expertise. It is therefore not surprising to learn that small and medium-sized hospitals embarking on the diagnosis and treatment of bone and soft tissue tumors are generally less success ful than better equipped major centers. This fact has already been recognized by most physicians and surgeons who now refer their patients to specialized oncologic centers. Nevertheless, they all have to know the present state of the art. This symposium was therefore mostly addressed to them. This international symposium, organized by the Division of Orthopaedic Surgery, University of Ottawa, and cosponsored by the Association des Chirurgiens Orthopedistes du Quebec, was held in Ottawa from May 12-14, 1983. Each of the 40 presentations clearly demonstrates that disregard for proper staging before initiation of treatment and omission of a clearly defined treatment protocol is definitely unacceptable in view of the knowledge we have acquired."

Der zweite Band des Gebietes Drogen der Neuauflage enthalt in alphabetischer Reihenfolge von E-O Monographien uber Arzneipflanzengattungen. Jede Monographie umfasst die fur die pharmazeutische Praxis wichtigen Arzneipflanzen mit den dazugehoerigen allopathischen und homoeopathischen Drogen. In den Monographien werden Aussagen uber die Botanik, Chemotaxonomie, Analytik, Wirkung, medizinische Anwendung und Toxikologie gemacht. Von besonderer Bedeutung sind Drogen des Deutschen Arzneibuchs, des Homoeopathischen Arzneibuchs und von in Europa gultigen Arzneibuchern.