Includes section, "Recent book acquisitions" (varies: Recent United States publications) formerly published separately by the U.S. Army Medical Library.

Zytologie.

Opera Acts explores a wealth of new historical material about singers in the late nineteenth century and challenges the idea that this was a period of decline for the opera singer. In detailed case studies of four figures - the late Verdi baritone Victor Maurel; Bizet's first Carmen, Célestine Galli-Marié; Massenet's muse of the 1880s and 1890s, Sibyl Sanderson; and the early Wagner star Jean de Reszke - Karen Henson argues that singers in the late nineteenth century continued to be important, but in ways that were not conventionally 'vocal'. Instead they enjoyed a freedom and creativity based on their ability to express text, act and communicate physically, and exploit the era's media. By these and other means, singers played a crucial role in the creation of opera up to the end of the nineteenth century.

Among the various groups of aquatic insects, mayflies (Ephemeroptera) are of special interest for professional limnologists and entomological researchers as well as for naturalists in general and even the dedicated fly angler. Identification has traditionally been considered difficult and implementation in environmental monitoring and freshwater management has led to an ever increasing demand for exact information on taxonomy and ecology. The present handbook is designed to provide for the first time an up-to-date standard work for Ephemeroptera identification, including last instar larvae (nymphs), subimago (dun), male and female imagines. Recent changes in nomenclature are discussed in detail as well as gaps in current knowledge and probable pitfalls concerning the reliable identification of all taxa known so far from the region. Keys are provided for genera and introductory chapters characterize every family and genus. Species accounts follow a common format providing a synonymy, characters for identification (including literature references), remarks (on type material, variation, confusing or extralimital species) and short information on biology and distribution pattern. Male genitalia are illustrated by micrographs and line drawings, REM photographs of the egg chorionic structure are provided for genera and selected species. Habitus of larvae and imagines are for most genera illustrated by colour photographs. The geographical area covered is Europe including the European part of Russia, the mediterranean islands and North Africa. Short additional information is provided for adjacent parts of the western Palaearctic Region. A comprehensive index, check-list and distribution catalogue (following the widely adopted concept of Illies’ Limnofauna Europaean) allow for quick information on all species recorded so far from Europe.