CH. IV.] 



AEEOLAR TISSUE 



31 



They are most abundant in the neighbourhood of blood- 

 vessels (fig. 41). The name was given to them by Ehrlich, 

 who erroneously believed that they multiplied on a rich 

 diet. Certain cells called clasmatocytes by Eanvicr are very 

 like the mast-cells, but their protoplasm branches. 



FIG. 41. Subcutaneous areolar tissue of the rat, showing a small blood-vessel, with numerous mast- 

 cells in the neighbourhood, also two fat-cells, x 540. 1, Small blood-vessel ; 2, mast-cell; 3, 

 fat-cell. (After Szymonowicz.) 



4. Wander cells. White blood-corpuscles which have emigrated 

 from the neighbouriag blood-vessels. 



The ground-substance. This is represented in fig. 38 by the 

 shaded background. 



It may be readily demonstrated in a silver nitrate preparation 

 (fig. 42); for the intercellular material has the same property of 

 reducing silver salts in the sun- 

 light that the cement-material of 

 epithelium has (see p. 27). 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. RecklinghaUSen the Soft FIG. 42. Ground-substance of connective tissue, 

 Tfri'nriTr'hff'n rr lifflA im'r>A ^armla stained by silver nitrate. The cell spaces are 



j^anaLcnen, or nttie juice canals. left white. (After schafer.) 

 Areolar tissue is certainly pro- 

 vided with blood-vessels, but the tissue elements are, as in all tissues, 

 provided with nutriment by the exudation from the blood called 



