CH. IV.] 



CONNECTIVE-TISSUE CORPUSCLES 



39 



4. Granule cells (" mast " cells of Ehrlich) : like plasma cells, but 



containing albuminous granules (stainable by basic aniline 

 dyes) instead of vacuoles. 



5. Wander cells: white blood-corpuscles which have emigrated 



from the neighbouring blood-vessels. 



6. Pigment cells: these are seen in the subcutaneous tissues of 



many animals, e.g., the frog, and in the choroid coat of the 

 eyeball. 

 Fig. 55 shows a highly magnified view of a small piece of sub- 



FIG. 55. Areolar tissue. The white fibres are seen in wavy bundles ; the elastic fibres form an open 

 network, p, p, Plasma cells ; g, granule cell ; c, e, lamellar cells ; /, fibrillated cell. (After 

 Schafer.) 



cutaneous tissue, and illustrates the irregular way in which the fibres 

 and cells are intermixed. 



The ground-substance. This may be represented in fig. 55 by the 

 white background of the paper. 



It may be readily demonstrated in a silver nitrate preparation ; 

 for the intercellular material has the same property of reducing silver 

 salts in the sunlight that the cement-material of epithelium has. It 

 becomes in consequence dark brown, with the exception of the spaces 

 occupied by the corpuscles. 



The spaces intercommunicate like the cells, and being consider- 

 ably larger than the cells form a ramifying network of irregular 

 channels, which were first termed by v. Eecklinghausen the Soft 

 Kanalchen, or little juice canals. Areolar tissue is certainly pro- 



