176 



BOTANY AND PHARMACOGNOSY. 



A. Cell-content Mucilage: Tuber, of Orchis sp. (salep) ; 

 rhizome of Agropyron re pens; bulb of Urginea maritima; bulb of 

 Allium sp. (onion, garlic) ; stem, leaf and elements of flower. 



Pig. 99. Cell-wall mucilage. A, transverse section of seed-coat of flaxseed treated 

 with water, showing the swelling of the mucilaginous layer beneath the cutin; B, section 

 of Althsea root showing three large mucilage-cells; C, transverse section of elm bark show- 

 ing four large mucilage-cells. 



excepting stamens, of Viola tricolor; flower-stalks of Hagenia 

 abyssinica; pulp of fruit of Musa paradisiaca (banana) ; succulent 

 plants, as aloe, etc. (See Fig. 98.) 



