The use of a desiccator and the selection of the desiccant will be discussed in this article in a practical form. As desiccant material calcium chloride, copper(II) sulfate, magnesium perchlorate, magnesium sulfate, molecular sieves 3Å, phosphorous pentoxide (as Siccapent), potassium carbonate, potassium hydroxide, silicagel, sodium carbonate, sodium sulfate and sulphuric acid are considered in this work. A classical desiccator (fig. ) consists of a base (B) and a lid (A). The base is divided in a lower (L) and an upper (U) compartment by a perforated ceramic plate (1). On top of the lid, there could be a glass joint to place a stop cock for evacuation of the desiccator (3). In the lower compartment of the base, a porcelain bowl (2) with desiccator is placed and the objects, which should be stored away from humidity, are placed in the upper compartment.