on Monitoring of Gaseous Pollutants by Tunable Diode Lasers which was held two years later on October 17-18, 1988, again in Freiburg. In addi­ tion to the main subjects treated in the first Symposium, the Scientific Programme this time presented a session on the development of lead chalco­ genide lasers. Once more, only a limited attention was given to applica­ tions in high resolution molecular spectroscopy. In order to complete the update, sessions on components and techniques were included in the Pro­ gramme. As for the previous Symposium, some space was also given to alter­ native optical techniques. This time, in particular contributions on laser photoacoustic detection were included.