EPITHELIAL CELLS— LUMBRICUS 135 



figure) show very plainly the meshwork of the protoplasm 

 arranged to form longitudinal striations. In the nodal 

 points of the meshwork very small granules are lodged, 

 which can only he seen with difficulty. In material pre- 

 served in iodine alcohol and stained with acid Delafield's 

 hematoxylin, it can, however, be made out plainly that 

 these granules are tinged reddish. Corresponding to their 

 small size the colour is naturally not very intense, but still 

 quite recognisable. Since the chromatin granules of the cell 

 nucleus also show the red coloration excessively plainly 

 with this method of staining, in sharp contrast to the blue 

 tinge of the framework, the granules of the nucleus and of 

 the protoplasm may be directly compared, and their' great 

 similarity in staining and in other respects established. 

 I have no doubt that both are nearly allied structures, and 

 that here conditions are presented to us similar to those 

 which have been described already for Flagellata, Diatoms, 

 etc. (see above, p. 91). I would particularly emphasise the 

 fact that the nuclei of the epithelial cells of Zumbricus ter- 

 restris show the distinction between the staining properties 

 of the framework and of the chromatin granules with special 

 distinctness, just as well as, in fact even more distinctly than, 

 I saw them in Cyanophycece, Euglenm, etc. The nuclei of the 

 gland cells also show the same relations, but their framer 

 work is arranged rather more densely, and in a different 

 way from that of the supporting cells. It is very similar to 

 that of the nuclei of Euglenoids, which I described briefly on 

 a former occasion (1890-91). 



In the longitudinal section of a supporting cell figured 

 on Fig. 3, Plate VI., it can be further observed fairly well 

 that the layer of meshes following directly under the 

 cuticle forms a kind of radiate alveolar layer, inasmuch 

 as it is marked off from the internal meshwork by a fairly 

 straight line, which of course only depends on the fact that 

 this most external limiting layer consists of meshes nearly 

 equal in size. It can further also be seen pretty clearly 

 that the layer of meshes surrounding the nucleus is arranged 

 radially to the surface of the latter. 



In tangential sections which pass through the outermost 



