acceptable, principally because there is no standard version of the language which includes self-contained routines. This volume contains 33 algorithms selected from the 200 orso which have so far been published in Applied Statistics. The algorithms were selected as being the most useful but also as those which have proved to be reliable and accurate, having been updated and corrected from their originally published versions. The updating has included the incorporation of all known and published corrections and improvements, together with some unpublished ones that further study has shown to be desirable. FORTRAN versions of algorithms originally published in ALGOL are also included. These algorithms are essential for anyone seriously interested in statistical computing. Indeed, even where statistical packages are in regular use, it would be advisable to compare the algorithms incorporated in the package with those published in Applied Statistics. There can, of course, be no guarantee that any algorithm is totally error-free, but this set has had the benefit of the concentrated attention of some of those scientists most expert in statistical computing. J N R Jeffers

MICROPROCESSOR PROGRAMMING AND APPLICATIONS FOR SCI ENTISTS AN D ENGINEERS Richard R. Smardzewski Elsevier, Amsterdam. 1984.

pp. 353 This book is the first volume of the new Elsevier series "Data Handling in Science and Technology". The book is written to provide researchers and students with specific guidelines on how to program and interface the popular 6502 micro- processor in a laboratory situation. A clear and straight- forward explanation of the fundamentals of micro- processing is presented and no prior background in computer science or programming is assumed. The book is a simple repro- duction of a typewritten manuscript. Nevertheless, it is well organized and easy to read. A subject index is provided. PZ

MATHEMATICAL MODELING OF WATER QUALITY: STREAMS, LAKES & RESERVOIRS Edited by Gerald T. Orlob John Wiley & Sons, Chichester, 1983, pp. 518 The book consists of 13 articles written by 10 authors. It is the result of the combined effort of very qualifiedcontributors and is the 12th volume in the Wiley IIASA International Series on Applied Systems Analysis. The book is well printed and organized. The same mathe- matical notation is used in all sections, and a general subject index is provided. Each article, however, has its own references. The 13 articles are: 1) Introduction; 2)A Procedure for Modeling; 3) General Principles in DeterministicWater Quality Modeling; 4) Modelling the Ecological Processes;

5) Simulation of the Thermal Regime of Rivers; 6) Stream Quality Modeling; 7) One- dimensional Models for Simulation of Water Quality in Lakes and Reservoirs; 8) Two- and Three-dimensional Mathe- matical Models for Lakes and Reservoirs; 9) Ecological Modeling of Lakes; 10) Modeling the Distribution and Effect of Toxic Substances in Rivers and Lakes; 11 ) Sensitivity Analysis, Calibration and Validation; 12) Models for Management Applications; 13) Future Decisions. This material is presented as an introductory volume which gives special attention to the general topics concerned with the modeling process itself and with the basic principles of modeling water quality. Each chapter tends to follow the general sequence by which models are developed: conceptualization, formulation, computational representation, solution, calibration, validation and application. The authors try to give concrete examples and show comparisons between simulated and observed measures of response. Among the several multi-author books I have recently seen, this is one of the most useful and well organized. PZ

Environmental Software, 1986, Vol 1, No. 1 61