FLOUBS. 



31 



PLATE XII. 



-aSP? 



n. f\ (/V^TJ) ^1 C9 o 



^OToflfO; 



^-^ O /\/A O U 0-^ i/ U' <^_ l.l 





Fig. 22. Barley Flour, (x 240.) 



a, a', Starch grains, smaller than those of wheat, and often reniform or exhi- 

 biting protuberances. 

 al, Aleurone. 



ap, Aleurone layer, with two or three rows of cells. 

 co, Cotyledon. 

 ct, Transverse cells. 

 e, Epidermis of pericarp. 

 ec, Scutellum. 



ei, Inner epidermis of palea, with little hairs. 

 es, Outer epidermis of palea, with sinuous cell walls. 

 flV, Fibro-vascular bundle of raphe. 



h, Fibrous hypoderma of palea (in upper right corner of plate), 

 h, Hyaline layer. 



p, Hairs on the epidermis of pericarp. 

 pa, Parenchyma of palea, with intercellular spaces. 

 pi, Pigment cells. 

 t, Tubular cells. 



