Note
Genuinely new detection methods like the flame ionization detector for gas chromatography (McWilliams and Dewar, 1958; Harley et al., 1958), mass spectrometry for structure determination (Biemann, 1962), and the use of whole insects (Flaschentrager et al., 1957) or isolated insect antennae (Schneider, 1957; Roelofs , 1984, Chapter 5, this volume) as biological detectors significantly increased the number of techniques available to the pioneers in the field 25 years ago (see Hecker and Butenandt, 1984, Chapter 1; this volume).