All Rookie Readers actively engage young readers, encouraging language development, building fluency, and promoting independent reading. By targeting a skill, like being able to write and speak consonants, young readers are building fundamental reading skills with the help of fun, lively, colorfully illustrated stories.

On the occasion of the retirement of Ulrich Schwarz, a symposium was held in Groningen in May of 1996, celebrating his contributions to the study of the int- stellar medium, including his work on the high-velocity clouds. The coming together of many specialists in the latter ?eld prompted the idea of compiling a book c- taining their contributions, and summarizing the status of our understanding of the high-velocity cloud phenomenon. This seemed especially worthwhile at the time, since many exciting developments were taking place. After the discovery of some H i clouds with high velocities, about 40 years ago, the subject had been dominated by 21-cm observations of H i emission. Starting in the mid-1980s much progress was being made because of the availability of new instruments, such as large ground-based optical telescopes and UV observatories in space. The connections between the work on high-velocity clouds and other studies of the properties of the (hot) interstellar medium also became clearer.

Imagine a land where all the animals are free . . . To the creatures of the woodland, the land of Animalia sounds like a dream - a tropical island where all the animals live in harmony. They are over-shadowed by a much more evil community; the polluted Megatropolis, whose dirty skyscrapers block the horizon. And then one day, Wirral the Squirrel's woodland is destroyed by developers and he is thrown into the nightmare world of Megatropolis. But Wirral believes in Animalia and he joins with Froggo, a world-class amphibian balloonist, and Wilhamina, a girl squirrel, to lead the enslaved animals of the city to a new life. So begins an exciting adventure through the mean streets of Megatropolis, over the sea and through the sky. Developed out of an exceptional fusion of creative talents, this story explodes onto every page. The plot is fast, furious and funny; the illustrations are full of rich depth and colour; and the characters live on long after you have turned the final page. It will delight children of all ages and is sure to become an enduring classic. 'Young audiences will delight in the clever wordplay and smartly-drawn comic characters.' Independent

The large-scale structure of the Universe and systems Clusters, and Groups of galaxies are topics like Superclusters, They fully justify the meeting on "Clusters of great interest. and Groups of Galaxies". The topics covered included the spatial distribution and the clustering of galaxies; the properties of Superclusters, Clusters and Groups of galaxies; radio and X-ray observations; the problem of unseen matter; theories concerning hierarchical clustering, pancakes, cluster and galaxy formation and evolution. The meeting was held at the International Center for Theoretical Physics in Trieste (Italy) from September 13 to September 16, 1983. It was attended by about 150 participants from 22 nations who presented 67 invited lectures (il) and contributed papers (cp), and 45 poster papers (pp). The Scientific Organizing Committee consisted of F. Bertola, P. Biermann, A. Cavaliere, N. Dallaporta, D. Gerba1, M. Hack, J . V . Peach, D. Sciama (Chairman), G. Setti, M. Tarenghi. We are particularly indebted to D. Sciama, A. Cavaliere and F. Bertola for their work of coordination. We were acting as the three members of the Local Organizing Committee. Moreover, we are pleased to thank the Chairmen of the Sessions (M. Hack, N. Da11aporta, G. Burbidge, B. Mills, M. Rees, P. Biermann, L.Z. Fang, L. Gouguenheim) for their valuable help.

The field of extreme ultraviolet astronomy will see two major satellite observatories to be launched in 1991, one by ESA (ROSAT mission), one by NASA (EUVE mission). These Proceedings discuss the potential for EUV Astronomy, results from recent missions, approved and possible future missions and new developments in EUV technology.