The L.A.D. contributes to the popularization of astronomy by providing guided tours for the public at the Old Observatory, located in the historical center of Leiden. Last year nearly 250 people took part in these tours. Special tours were given in honor of the birthday of F. Kaiser to his kin. Other tours and lectures were given by Nuyten, van Kempen, van Vugt, Holl, van Boven, Wuyts, Meijerink and ter Haar.