Introduction This book contains papers given at a NATO Advanced Research Institute (A.R.I.) held at Caiscais, Portugal, in November, 1981. The subject of the A.R.I. was marine heterotrophy; this is defined as the process by which the carbon autotrophically fixed into organic compounds by photosynthesis is transformed and respired. Obviously all animals and many microbes are heterotrophs but here we will deal only with the microbes. Also, we restricted the A.R.I. primarily to microbial heterotrophy in the water column even though we recognize that a great deal occurs in sediments. Most of the recent advances have, in fact, been made in the water column because it is easier to work in a fluid, apparently uniform medium. The reason for the A.R.I. was the rapid development of this subject over the past few years. Methods and arguments have flourished so it is now time for a review and for a sorting out. We wish to thank the NATO Marine Science Committee for sharing this view, F. Azam, A.-L. Meyer-Reil, L. Pomeroy, C. Lee, and B. Hargrave for organizational help, and H. Lang and S. Semino for valuable editing aid.

From jewellery designers to scientists, graphic artists to naturalists, the range of people inspired by Ernst Haeckel's illustrations continues to grow. Following up on Prestel's Art Forms in Nature and Art Forms from the Ocean, this new collection features startlingly beautiful images created by Haeckel, who was commissioned to contribute to the report of the HMS Challenger expedition, which circumnavigated the world from 1872-76. The Challenger's achievements were unparalleled, with nearly 5,000 new species discovered and catalogued from the depths of Earth's oceans. Full-page reproductions bring these organisms colourfully to life, drawing readers into a world at once hypnotic and highly ordered. Divided into three sections-Siphonophores, Medusae and Radiolarians-these illustrations display Haeckel's remarkable artistic skill and understanding of the architecture of organic matter. The authors provide a brief history of the Challenger expedition, background on Haeckel's scientific and artistic accomplishments, as well as informative texts on each group of organisms.A guide to the natural world and an inspiration to artists of every stripe, this collection of Haeckel's work is a fitting tribute to a 19th century genius.