A trap for insects, particularly for wasps, comprises a vapour chamber having at least one insect entrance defined in a wall of the vapour chamber, and a bait or collection chamber couplable to the vapour chamber at a restriction. Suitably, diffuse reflectance infrared Fourier transformation spectroscopy is employed to detect the presence of organic compounds in gems using mid infrared and near infrared radiation. A plurality of sorting banks each having a plurality of sorting modules, each sorting module adapted for the face-to-face conveyance of mailpieces for sorting by transferring select mailpieces from a first to a second conveyance path. The galvano-scanner can be controlled in a simple manner to move from a current position to an arbitrary position. By varying the register value in response to the reception state, the number of the sampling points can be increased from the specified 16 points, for example. A PCP flow with a higher PCP value can be assigned to a lower priority virtual channel, whereas a PCP flow with a lower PCP value can be assigned to a higher priority virtual channel.