that even tlie older cells are c-ctuflly in physical and 

 organic connection tlirongh the large open pores in the 

 cross v;alls. 



A tj^ical intercellular connection is shown in fig, 6. 

 The pore in tiie cross walls is closed on each side by a 

 disk, v.hich is the "stopper", or "plug" of ARCKER ('80). 

 This disk is in direct conta.ct with the thickened pad of 

 cytopla-sm lying on the cross wall. Connecting the disks 

 is a "broad strand of tldn clear cytoplasm, or, in some 

 cases, several smaller strs.nds (fig. 7.}, In several in- 

 stci,nces, hits of tlie proteid suhstance norms.llj'- present in 

 the pad liave "been found in the cytoplasmic strund which 

 connects neighboring disks, apparently having been fixed in 

 transit from one cell to another (fig. 8). The middle la- 

 mella mentioned later as being formed in some cases 

 in cell divisions lias not been demonstrated in the older 

 intercellular connections. 



Tlie size of the pore varies wit]), the size of the cells 

 whicli it connects. The average diyjneter of the disks, whitK 

 is the sojae as that of tl;e pore, is about 11 1^ in tiie large 

 cells at some dista,nce from the apex. 



In living and in unstained fixed me.terial the disks 

 are refractive colorless bodies. They stain }ieavily v/ith 



