RETICULAR AND OTHER CONNECTIVE TISSUES 295 



laj-^er of collaginous tissue upon which they rest. It would there- 

 fore appear that the basement membrane of the sweat glands, 

 unlike most other basement membranes, contains no reticulum 

 but is formed by collaginous fibers together with the peculiar 

 basket-cells, be they fibroglia or muscle. If one compares in the 

 same way the reticulum of lymj^hoicl tissues one arrives at similar 

 conclusions as to the non-identity of ' reticulum' (viz. those fibers 

 which blacken with the Bielschowsky method) and fibroglia. 

 It would therefore appear that in the mature tissues there is no 

 identity between fibroglia and reticulum nor for the same reasons 

 can there be between fibroglia and the fibers which blacken with 

 Bielschowsky's stain. These last are identical with certain fibers 

 which are colored blue by Mallory's stain. 



SUMMARY 



Briefly summing up we find that the Bielschowsky stain applied 

 to the connective tissues of mature individuals exerts a selective 



Fig. 13 A small lymphatic nodule from the submucosa of the human esophagus? 

 showing the 'perifollieular plexus' of Ciaccio sharply defined, but with reticular 

 fibers intertwining with the collaginous fibers. 



The collaginous tissue is drawn free-hand, the reticulum by camera lucida; 

 occ. 1, obj. i 



action, blackening certain fibers which are certainly not identical 

 with either elastic or fibroglia fibers, which in many cases certainly 

 are identical with the fibers of reticulum, and which in some cases 

 show a certain tendency suggesting possible transitions between 

 reticular and collaginous fibers. The typical collaginous fibers do 



