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It is becoming increasingly difficult to write a book which is not out of date in a number of minor, and perhaps a few major, particulars, because advances in every field are continually appearing in print and no-one can hope to keep abreast of all of them. The present authors do not venture to hope that they have not erred, but they have been in what are undoubtedly the most favourable circumstances for writing a book of this kind. Members of the staff of a freshwater biological station, they have been surrounded by colleagues each an expert in one of the fields touched in the following pages. Moreover, these colleagues have been willing to read through chapters on their subjects and draw attention to errors and defects. Mr H. C. Gilson has read chapters 1, 2, and 4; Dr C. H. Mortimer chapters 2, 4, and 9; Dr J. W. G. Lund and Dr Hilda Canter have assisted with the botanical parts of several chapters; Dr W. E. Frost has read chapters 11 and 12; Mr E. D. Le Cren chapters 12 and 13; and Dr C. B. Taylor chapters 14 and 15. Captain C. Diver, C.B.E., Director of the Biological Service, and Mr F. T. K. Pentelow of the Ministry of Agriculture and Fisheries have criticized chapters 8 and 14 respectively. It is appropriate to acknowledge at this point that the editorial board has made many helpful suggestions.

No less important is a lay impression, since it is not for specialists and professional biologists that this book is primarily written. For this we are indebted to Mrs Zaida Macan, who has read through the whole typescript; and to Mr Maurice Illingworth, who has read Chapter 12.

We record all this kindness with gratitude and take the opportunity to thank those who have helped us.