Chicago, the Leverhulme Trust (for an emeritus fellowship awarded to Maurice Kogan which enabled a particular part of the English study to be completed) and to the Bank of Sweden Tercentenary Foundation which provided funds assisting us with the last stage of the project and its dissemination. The list of names of the editorial team on the cover of this book in no sense exhausts the account of its authorship or of those responsible for the contr- utory country studies. Our equal partners in the whole exercise have been Steve Hanney (England), Berit Askling and Susan Marton (Sweden), and Roar Høstaker and Agnete Vabø (Norway). The names of individual authors are to be found at the beginning of each chapter. Throughout the five years of our project we have enjoyed an intellectual camaraderie which enabled the expe- ence of different cultures and systems to flow into our research. We are also indebted to Tom Kogan for expert copy editing of the first v- sion and to Deana Parker for producing a camera ready version of this second edition. Our first publishers, on selling out the first edition, arbitrarily took the book out of print. We have been fortunate in finding new publishers, Springer, for this second edition which has given us the opportunity to update our macro data about changes in systems and advance further some of our arguments.

Chicago, the Leverhulme Trust (for an emeritus fellowship awarded to Maurice Kogan which enabled a particular part of the English study to be completed) and to the Bank of Sweden Tercentenary Foundation which provided funds assisting us with the last stage of the project and its dissemination. The list of names of the editorial team on the cover of this book in no sense exhausts the account of its authorship or of those responsible for the contr- utory country studies. Our equal partners in the whole exercise have been Steve Hanney (England), Berit Askling and Susan Marton (Sweden), and Roar Høstaker and Agnete Vabø (Norway). The names of individual authors are to be found at the beginning of each chapter. Throughout the five years of our project we have enjoyed an intellectual camaraderie which enabled the expe- ence of different cultures and systems to flow into our research. We are also indebted to Tom Kogan for expert copy editing of the first v- sion and to Deana Parker for producing a camera ready version of this second edition. Our first publishers, on selling out the first edition, arbitrarily took the book out of print. We have been fortunate in finding new publishers, Springer, for this second edition which has given us the opportunity to update our macro data about changes in systems and advance further some of our arguments.

Insects as a group occupy a middle ground in the biosphere between bacteria and viruses at one extreme, amphibians and mammals at the other. The size and gen­ eral nature of insects present special problems to the student of entomology. For example, many commercially available instruments are geared to measure in grams, while the forces commonly encountered in studying insects are in the mil­ ligram range. Therefore, techniques developed in the study of insects or in those fields concerned with the control of insect pests are often unique. Methods for measuring things are common to all sciences. Advances sometimes depend more on how something was done than on what was measured; indeed a given field often progresses from one technique to another as new methods are discovered, developed, and modified. Just as often, some of these techniques fmd their way into the classroom when the problems involved have been suffici­ ently ironed out to permit students to master the manipulations in a few labo­ ratory periods. Many specialized techniques are confined to one specific research laboratory. Although methods may be considered commonplace where they are used, in another context even the simplest procedures may save considerable time. It is the purpose of this series (1) to report new developments in methodology, (2) to reveal sources of groups who have dealt with and solved particular entomological problems, and (3) to describe experiments which might be applicable for use in biology laboratory courses.

Insects as a group occupy a middle ground in the biosphere between bacteria and viruses at one extreme, amphibians and mammals at the other. The size and gen­ eral nature of insects present special problems to the student of entomology. For example, many commercially available instruments are geared to measure in grams, while the forces commonly encountered in studying insects are in the mil­ ligram range. Therefore, techniques developed in the study of insects or in those fields concerned with the control of insect pests are often unique. Methods for measuring things are common to all sciences. Advances sometimes depend more on how something was done than on what was measured; indeed a given field often progresses from one technique to another as new methods are discovered, developed, and modified. Just as often, some of these techniques fmd their way into the classroom when the problems involved have been suffici­ ently ironed out to permit students to master the manipulations in a few labo­ ratory periods. Many specialized techniques are confined to one specific research laboratory. Although methods may be considered commonplace where they are used, in another context even the simplest procedures may save considerable time. It is the purpose of this series (1) to report new developments in methodology, (2) to reveal sources of groups who have dealt with and solved particular entomological problems, and (3) to describe experiments which might be applicable for use in biology laboratory courses.

Chicago, the Leverhulme Trust (for an emeritus fellowship awarded to Maurice Kogan which enabled a particular part of the English study to be completed) and to the Bank of Sweden Tercentenary Foundation which provided funds assisting us with the last stage of the project and its dissemination. The list of names of the editorial team on the cover of this book in no sense exhausts the account of its authorship or of those responsible for the contr- utory country studies. Our equal partners in the whole exercise have been Steve Hanney (England), Berit Askling and Susan Marton (Sweden), and Roar Høstaker and Agnete Vabø (Norway). The names of individual authors are to be found at the beginning of each chapter. Throughout the five years of our project we have enjoyed an intellectual camaraderie which enabled the expe- ence of different cultures and systems to flow into our research. We are also indebted to Tom Kogan for expert copy editing of the first v- sion and to Deana Parker for producing a camera ready version of this second edition. Our first publishers, on selling out the first edition, arbitrarily took the book out of print. We have been fortunate in finding new publishers, Springer, for this second edition which has given us the opportunity to update our macro data about changes in systems and advance further some of our arguments.

Chicago, the Leverhulme Trust (for an emeritus fellowship awarded to Maurice Kogan which enabled a particular part of the English study to be completed) and to the Bank of Sweden Tercentenary Foundation which provided funds assisting us with the last stage of the project and its dissemination. The list of names of the editorial team on the cover of this book in no sense exhausts the account of its authorship or of those responsible for the contr- utory country studies. Our equal partners in the whole exercise have been Steve Hanney (England), Berit Askling and Susan Marton (Sweden), and Roar Høstaker and Agnete Vabø (Norway). The names of individual authors are to be found at the beginning of each chapter. Throughout the five years of our project we have enjoyed an intellectual camaraderie which enabled the expe- ence of different cultures and systems to flow into our research. We are also indebted to Tom Kogan for expert copy editing of the first v- sion and to Deana Parker for producing a camera ready version of this second edition. Our first publishers, on selling out the first edition, arbitrarily took the book out of print. We have been fortunate in finding new publishers, Springer, for this second edition which has given us the opportunity to update our macro data about changes in systems and advance further some of our arguments.

Insects as a group occupy a middle ground in the biosphere between bacteria and viruses at one extreme, amphibians and mammals at the other. The size and gen­ eral nature of insects present special problems to the student of entomology. For example, many commercially available instruments are geared to measure in grams, while the forces commonly encountered in studying insects are in the mil­ ligram range. Therefore, techniques developed in the study of insects or in those fields concerned with the control of insect pests are often unique. Methods for measuring things are common to all sciences. Advances sometimes depend more on how something was done than on what was measured; indeed a given field often progresses from one technique to another as new methods are discovered, developed, and modified. Just as often, some of these techniques fmd their way into the classroom when the problems involved have been suffici­ ently ironed out to permit students to master the manipulations in a few labo­ ratory periods. Many specialized techniques are confined to one specific research laboratory. Although methods may be considered commonplace where they are used, in another context even the simplest procedures may save considerable time. It is the purpose of this series (1) to report new developments in methodology, (2) to reveal sources of groups who have dealt with and solved particular entomological problems, and (3) to describe experiments which might be applicable for use in biology laboratory courses.

Insects as a group occupy a middle ground in the biosphere between bacteria and viruses at one extreme, amphibians and mammals at the other. The size and gen­ eral nature of insects present special problems to the student of entomology. For example, many commercially available instruments are geared to measure in grams, while the forces commonly encountered in studying insects are in the mil­ ligram range. Therefore, techniques developed in the study of insects or in those fields concerned with the control of insect pests are often unique. Methods for measuring things are common to all sciences. Advances sometimes depend more on how something was done than on what was measured; indeed a given field often progresses from one technique to another as new methods are discovered, developed, and modified. Just as often, some of these techniques fmd their way into the classroom when the problems involved have been suffici­ ently ironed out to permit students to master the manipulations in a few labo­ ratory periods. Many specialized techniques are confined to one specific research laboratory. Although methods may be considered commonplace where they are used, in another context even the simplest procedures may save considerable time. It is the purpose of this series (1) to report new developments in methodology, (2) to reveal sources of groups who have dealt with and solved particular entomological problems, and (3) to describe experiments which might be applicable for use in biology laboratory courses.