TECHNOLOGY FOCUS - BIOLOGY - Preferred Components: The wood comprises Douglas fir or larch wood.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The worm composter exhibits: at least two identical floors, where each of them is stackable on one another and is bordered by a side wall made of wood for introducing the organic material and worm humus; and a base element with passable openings for the compost worms. The side wall of a floor is arranged downwards obliquely towards the outer side, in such a way that during the stacking of the floors, at least a portion of upper edge of the lower floor (8) is fixed towards the inner side with respect to lower edge of the upper floor (7). The lower edge of the upper floor exhibits a separate supporting device in the inner side, by means of which the upper floor is supported during stacking on the fixed part of the upper edge of the lower floor. A lowest floor is designed in the worm composter for receiving and collecting the worm tea. A coating with plastic film is provided for receiving the worm tea. A drain hole and preferably an associated drain hose are provided in the lowest floor for the warm tea. The worm composter is provided with a fixing device, with which a distal section of the drain hose can be attached above the drain hole. The drain hose is formed translucent. A separator dropping towards the drain hole is provided in the lowest floor, for bounding the receiving space for the warm tea, towards the bottom. The separator exhibits a tray. The lowest floor is separated from the immediate floor by a worm separator, which does not pass the composting worms. A spacer attachable to ground and which is spaced from the worm composter is provided below the lowest floor of the worm composter. The worm composter is provided with a roof floor attachable to the topmost floor. The roof floor exhibits roof trays, which descend obliquely towards the outer side, where a roof tray situated above rests with an overlap on a roof tray situated below. A tilting device is provided in one floor, by which the floor stacked on it or a roof floor fitted on it can be tilted above. The tilting device is formed as a groove arranged outside to an upper edge of the lower floor for receiving a lower edge of the upper floor or the roof floor. All elements, optionally and possibly with the exception of fasteners, including roof cover, base element, drain hose and worm separator are made of wood.