The intracellular organization of very young glandular hairs is practically the same as in ordinary epidermal cells. The sole difference is found in a stronger development of the endoplasmatic reticulum. The vacuols contain strongly osmophilic substances. The cell wall is differentiated in cuticule, cuticular layer, pectic layer and cellulosic layer. Older glandular cells show a great increase in Golgi–bodies and of endoplasmatic reticulum. These structures occupy the whole space between the many little vacuoles with their osmophilic content. The membranes of the reticulum are occupied by a large number of ribosomes. At this stage the cytoplasm retracts irregularly from the cell wall leaving the so called extraplasmatic space. The cell wall becomes split between the pectic and the cuticular layer; in this way the subcuticular space characteristic of many types of glandular hairs develops. In the cuticular layer of glandular hairs sporadic pores are discernible; these probably can be closed by pectine plugs. During the production of the excretion the content of the vacuols of the glandular cells seems to be exhausted; in old cells the vacuols are empty and the extraplasmatic space is much enlarged.