114 MICROSCOPICAL RESEARCH 



PLATE XXII. 



CELL STEUCTIJRE AND CELL CONTENTS. 



Fig. 78. Transverse section. Stem of Tradescantia. ' Tradescantia 

 discolor ' x 35 dia. Fixed with Chromo-Acetic solution. 

 Stained with Hoematoxylin and Gossypimine. 1. Empty 

 cells ; 2. Cells containing starch. 3. Vascular bundles. 



Fig. 79. Transverse section. Stem of Pellionia. ' Pellionia 

 Daveauna ' x 65 dia. Fixed with Chromo-Acetic solution. 

 Stained with Hsematoxylin and Gossypimine. Starch 

 containing cells in primary ground tissue. 



Fig. 80. Longitudinal median section. Apex of Root. 'Aspidium 

 filix-mas ' x 180 dia. Fixed with Chromo-Acetic solution. 

 Stained with Brazilin. (Cut ^/cooo by the 'cold' paraffin 

 method.) 1. Apical cell. 2. Zone of primary meristem 

 tissue. 3. Protective root-cap tissue. 



Fig. 81. Longitudinal section. Aerial Root of 'Monstera deliciosa' 

 X 180 dia. Fixed with Chromo-Acetic solution. Stained 

 with Brazilin. (Cut ^ / 3000 in- by the ' cold ' paraffin method.) 

 1. Bundles of raphides. 2. Nucleus of crystal - sac 

 3. Primary nucleated ground tissue. 4. Nuscleus in 

 division. 



