214 



JOHN SUNDWALL 



Kopsch-Golgi 



In Kopsch-Golgi preparations the luraina of the intercalary 

 ducts and tubules and the secretion capillaries are definitely 

 marked by the heavy black deposit, which gives an exact cast of 

 them (fig. 16.) 



In the tubules numerous secretory capillaries are seen radiat- 

 ing from the central irregular lumina. These vary in length, 

 some forming only slight indentations between the cells while 

 others almost touch the basement membrane. The ends of 



Fig. 1() Kopsch-Ciolfii silver iiiiprcgiKitioii, Tt 

 AA — showing; sccn-tion oaijillaries, lumina of tubu 



J I, 4, Z( 



md (luct«. 



comp. 18, (^1) 



these capillaries are rounded and in many instances terminate 

 in slight bulb-like swellings or knoljs. Many branch at irregular 

 distances from their origin. Some branch immediately upon 

 leaving the lumina — others, after coursing some distance be- 

 tween two cells, branch to straddle the small demilune cells. 

 In many instances the terminal branches are so numerous that 

 they form irregular rosettes with many short club-like rays pro- 

 jecting in ever}^ direction. These rays frpc}uently api^ear to be 



