The Microscope. 



171 



tides of hardened albumen are found in some of these cells. 

 Small masses of resin are found between the cells, or attached 



to the outside of the cell-wall- 

 The majority of these parti- 

 cles of resin are not more 

 than Were of an inch in diam- 

 eter. A mass is occasionally 

 found (as atra, Fig. 2), much 

 larger and firmer, and even 

 rfo- of an inch in diameter. 

 This resin is not entirely sol- 

 uble in alcohol, and is turned 

 a blue color by aniline. 



Just inside of this paren- 

 chyma is the endodermis, 

 loaded with a dark-yellow 

 coloring-matter. On the cross 

 section, the cells are thick- 

 walled, small, oval or square ; 

 but on the longitudinal sec- 

 tion they are tour or five 

 times longer. The endoder- 

 mis is the dividing line be- 

 tween the starch-bearing pa- 

 renchyma and the liber part 

 of the rhizome. There is 

 quite a difference in different 

 rhizomes, both in the size and 

 color of these cells, and they 

 differ even in the same rhi- 

 zome according to their dis- 

 tance from the leaf-bearing 

 Fig. 3. end. 



Longitudinal section of the rhizome. Inside of the endodermis 



Drawn with the %-in. objective and the "C" , _. -ii j 



are found simple, thin-wallea, 

 hexagonal cells of phloem, containing protoplasm and albumen. 

 Embedded in this phloem are clusters of liber fibre, each clus- 

 ter containing from three to eight small, bright yellow, hexag- 

 onal cells of prosenchyma, having several successive layers of 



